How long does it actually take to prepare for a first marathon, and what matters most?

Somewhere between 16 and 30 weeks, depending on your starting point — but the number that should set your timeline isn't fitness, it's tissue. Aerobic fitness adapts in 6-12 weeks while connective tissue and bone remodel over months, which is why true beginners need 24-30 weeks (often preceded by a base-building block) while runners already covering 25-40 km/week need 16-20. Those timeline ranges are expert consensus, not trial evidence. The best-evidenced practices are simple: ~80% easy running, a long run capped at 25-30% of weekly volume, keeping single runs at or below your longest run of the past 30 days, 2-3 weekly strength sessions of heavy progressive lifting, a 2-week taper cutting volume 41-60% while holding intensity, and 60-90 g/hour of race-day carbohydrate. Track progress with pain-free running, resting heart rate, and pace-at-heart-rate — not the 10% rule, the acute:chronic workload ratio, or a 5K time predictor, all three weaker than commonly believed.

July 20, 2026 Updated July 31, 2026Runima Team

Your First Marathon: It's Tendons, Not Fitness

A safe first marathon: readiness, timelines, training, tapering, and fueling, with every claim rated for evidence strength.

Somewhere inside every "couch-to-marathon in 16 weeks" plan, two systems adapt on very different timelines, and almost nobody mentions it. Your cardiovascular system — the part everyone associates with marathon fitness — adapts in about 6-12 weeks. Your tendons, ligaments, and bone, the tissue actually tasked with absorbing 26.2 miles of repetitive impact, need 6-12 months to remodel. Most generic first-marathon plans are built around the faster system. Most first-marathon injuries come from ignoring the slower one.

If sub-3 and sub-4 are about physiology clearing a bar on race day, your first marathon is a different challenge: can your body absorb months of accumulating load without breaking down, and can you execute 26.2 miles you've never covered before, on a day that only happens once? This is a research-backed answer to both questions — with every claim rated for how solid the evidence actually is.

Two clocks, one body

The mismatch behind that opening callout is the single most useful idea in the sports-science literature on this topic. VO₂max, capillarization, and mitochondrial density all improve within 6-12 weeks of consistent training. Tendons, ligaments, and bone need months — commonly quoted as 6-12 — to remodel and tolerate repetitive loading. A plan that only tracks how fit you feel misses the slower adaptation that often limits beginners.

Evidence note: the "6-12 weeks vs 6-12 months" contrast is a synthesis, not a single measured result. The cardiovascular half is well established from training studies. The connective-tissue half is inferred from tissue-turnover and bone-remodeling research plus clinical experience, and the true figures vary enormously by tissue — bone remodels on a roughly 3-4 month cycle, while the collagen core of a mature tendon turns over far more slowly than that. The difference in adaptation timelines is well supported and is the point of this article. The exact numbers are a useful rule of thumb, not a measurement.

Physiological readiness

A practical floor before starting a marathon-specific block: comfortably run (or run/walk) continuously for ~30 minutes, or run 5 km, three times a week, for several weeks — sustained, not a one-off. A weekly volume around 20-30 km is a common starting base for beginner plans; the peak the plan builds toward matters more than where you start. The London Marathon 2017 MRI cohort defined "physically inactive" as not meeting 30 minutes of moderate activity 5x/week — that group needs the longer runway below.

Medical clearance

The ACSM pre-participation algorithm (Riebe et al., 2015) triages on three things — current exercise habits, known cardiovascular/metabolic/renal disease, and signs or symptoms of it — and does not require routine clearance for apparently healthy people. Note that the 2015 update deliberately removed age and cardiovascular-risk-factor counting as triggers; the familiar "men over 45, women over 55" cutoff comes from the older guideline and survives mostly as folklore. Under the current algorithm what should send you to a physician is known disease, symptoms (chest discomfort, unexplained breathlessness, palpitations, syncope), or a family history of sudden cardiac death — at any age.

Musculoskeletal & behavioral readiness

Previous injury is one of the most consistent predictors of future running injury, and marathon training is itself a documented risk factor (RISC study, 258 runners, 2023). The strongest behavioral predictor of finishing a training block is an already-established running habit; many coaches use a half-marathon or structured 10K build as the checkpoint that teaches pacing, fueling, and long-run discipline before marathon training begins.

Screening is reassuring on average and unreliable individually. In a study of 25 healthy 35-50-year-old first-time-marathon men, ACSM screening classified every single participant as "medical clearance not necessary" — while extensive testing (ECG, echo, CPET, cardiac MRI, bloods) found at least one abnormality or cardiovascular condition in 17 of 25, three of them serious enough to restrict intensive sport: an aortic aneurysm, hypertrophic cardiomyopathy, and post-myocarditis myocardial fibrosis. ESC screening did little better — it flagged two men as high-risk, and both flags were for very high cholesterol; the one serious condition it caught was caught for the wrong reason (van Steijn et al., 2024). Twenty-five men is a small sample, so read this as a demonstration that standard screening can miss serious disease, not as a reliable 68% miss rate. Meanwhile, absolute risk stays very low: the RACER2 registry (Kim et al., JAMA 2025, 29,311,597 US finishers, 2010-2023) found 176 cardiac arrests — an incidence of 0.60 per 100,000, higher in men (1.12) than women (0.19) and in the full marathon (1.04) than the half (0.47) — essentially unchanged from 2000-2009, though case-fatality dropped from 71% to 34% thanks largely to on-course AEDs and bystander CPR. Both things are true at once: a "cleared" screen is not a guarantee, and the actual risk is small. Chest pain, unexplained breathlessness, or fainting override all of it — stop and see a physician.

There's a genuinely hopeful side to this too: cardiac MRI on 138 first-time London Marathon runners found that six months of training for one marathon knocked roughly four years off vascular age (3.9-4.0 years, measured as increased descending-aorta distensibility), alongside a 4 mmHg systolic and 3 mmHg diastolic blood-pressure drop. That BP change is real and worth having, but it is roughly half what a standard first-line antihypertensive delivers — treat it as a meaningful bonus, not a substitute for medication. The heart adapts fast, in the right direction. Tendons and bone need the longer runway.

How long will this actually take you?

Starting point	Realistic timeline	Why
Complete sedentary beginner	24-30 weeks (often preceded by a base block)	Couch→5K→10K→half→full is the safer on-ramp; some coaches argue for 12-18 months of pure base for lowest injury risk
Recreational runner (comfortable with 5-10 km runs, ~20-30 km/week)	16-20 weeks	Standard, well-supported by program-design consensus
Comfortable half-marathoner	12-16 weeks	Pacing, fueling, and long-run discipline already rehearsed
Masters (40+)	Same weeks, denser recovery	48-72h between hard sessions vs 24-36h in the 20s; a 9-10 day microcycle helps; more strength work, ~1.6-2.4 g/kg/day protein
Time-crunched (3 days/week)	Workable, but concentrates load	Spreading volume across 4-5 days is better-evidenced when it's an option

None of these ranges come from a randomized trial — nobody has assigned real people to different marathon-prep durations and tracked outcomes. They're expert consensus and observational data, reasoned backward from the 6-12 month connective-tissue timeline. Treat them as informed defaults, not fixed physiological rules.

The training that actually works

Intensity: mostly easy, occasionally hard. The recurring elite pattern is roughly 80% low intensity, 20% at or above threshold, and that part is not seriously contested. Which type of hard training is better — pyramidal (more moderate/threshold work, minimal very-high-intensity) or polarized (mostly easy plus genuinely hard intervals, little in between) — is much less settled, and the honest answer for a first-timer is that it probably doesn't matter much yet.

Be careful with how this evidence gets quoted. A 2025 randomized trial assigned 120 recreational marathon runners — people already running marathons, not first-timers — to 16 weeks of pyramidal or polarized training, and found polarized produced the larger improvement (11.3 ± 3.2 vs 8.7 ± 2.8 min, p < 0.03) (Qin et al., Sci Rep 2025). Its more interesting result is the spread: clustering individual responses produced polarized responders (31.5%), pyramidal responders (31.9%), dual responders (18.7%) and non-responders (17.9%). So the group-level winner was polarized, but roughly a third of runners did better on the other plan and about one in six improved on neither. None of it was measured in true beginners.

For a first-timer, the practical takeaway is unchanged by any of that: keep the large majority of running conversational, add a modest amount of threshold work, and treat very-high-intensity intervals as optional. Your limiting factor in a first build is tissue tolerance and consistency, not interval selection.

The 10% rule has weak support. A University of Groningen RCT of 532 novices compared a standard 8-week program against an adapted 13-week program built on the 10% rule and found essentially identical injury rates — 20.8% vs 20.3% (p = .90) (Buist et al., 2008). Spreading the same build over five extra weeks bought nothing measurable.The stronger evidence points to a different pattern. In a 5,205-runner cohort across 588,071 sessions (Frandsen et al., BJSM 2025), a single run that exceeded your longest run of the prior 30 days raised overuse-injury risk at every magnitude tested, versus a reference of regression or ≤10%: a >10-30% spike carried a hazard-rate ratio of 1.64 (95% CI 1.31-2.05), >30-100% 1.52 (1.16-2.00), and >100% 2.28 (1.50-3.48) — while "no relationship was identified for the week-to-week ratio." An earlier JOSPT cohort found a >30% two-week progression raised risk of patellofemoral pain, ITB syndrome, and shin splints specifically (Nielsen et al., 2014).Note what those three numbers do and don't show: risk is elevated across the board and highest for the biggest spikes, but it is not a clean dose-response — the middle band (1.52) sits slightly below the smallest one (1.64), and the confidence intervals overlap heavily. The signal is "any spike past your recent longest carries risk," not "risk rises smoothly with spike size."Practical translation: the safe zone is at or below your longest single run of the past 30 days; treat anything beyond it — including a 10-30% step — as a deliberate, sparingly-used stressor, and judge it against that longest run rather than last week's total mileage.

The long run. Coaching consensus (RRCA, Noakes, Daniels, Hansons) caps the long run at ~25-30% of weekly volume; Daniels caps duration at 2.5-3 hours regardless of distance, and the "sacred" 20-miler isn't universal — the Hansons method peaks at 16 miles with higher overall weekly volume instead. Observational data on half and full marathon cohorts found that >65 km/week associated with a faster marathon finish, while <40 km/week and a longest run under 25 km associated with slower ones (for the half: >32 km/week and a longest run >21 km) (Fokkema et al., 2020). Two caveats that get dropped when this study is cited: it is cross-sectional and self-reported, so faster runners training more is at least as plausible as training more making them faster — and the same study identified no association between any training characteristic and injury, which is a null result in an observational design, not a reason to increase volume without caution.

Run-walk (Galloway) isn't a fallback — it's a legitimate, evidence-supported strategy. In a trial of 42 non-elite marathoners, run-walk finishers (4:14) and continuous runners (4:08) posted times with no statistically significant difference, while the run-walk group reported markedly less muscle pain and exhaustion afterwards (Hottenrott et al., J Sci Med Sport 2016). Read that carefully: with 42 runners, "no significant difference" means the study couldn't detect a ~6-minute gap, not that the strategies are proven equivalent — a real but modest time cost can't be ruled out. The reduction in soreness is the clearest finding. Ratios scale to fitness: beginners around 2:1 run:walk (or 1:1 in heat), stronger runners 4:1-5:1. Walk breaks reduce cumulative impact loading and are standard in return-to-run protocols — this is training strategy, not settling.

Strength training is the single best-evidenced injury-prevention tool available. A meta-analysis of 25 trials and 26,610 participants found strength training cut overall sports injuries to under a third and roughly halved overuse injuries specifically (RR 0.527, Lauersen et al., BJSM 2014). For performance, a systematic review of 469 trained runners found strength work improves running economy 2-8% without adding harmful mass (Blagrove et al., 2018), and a separate pooled analysis put the average economy gain at ~4% (Denadai et al., 2017). Prescription: 2-3 sessions/week, multi-joint heavy lifts (squat, deadlift, hip thrust, lunge, calf raise) at ≥80% 1RM, 2-4 sets of 3-6 reps, for at least 6-8 weeks, plus hip/glute stability work (hip abductor and glute weakness link to patellofemoral pain and ITB syndrome).

One trial adds an important limitation. A randomized study of 720 first-time NYC Marathon runners found major-injury incidence of 8.9% and minor of 48.5% — and a self-directed 10-minute, 3×/week quad/hip-abductor/core routine, delivered by written and video instruction, did not reduce the primary outcome: 7.1% vs 7.3% overuse injury causing marathon non-completion (RR 0.97, 95% CI 0.57-1.63, p = 0.90) (Toresdahl et al., Sports Health 2020). Two things separate this from the meta-analytic evidence rather than contradicting it: the dose is far below the heavy, progressive loading that Lauersen's trials used, and the endpoint was narrow — only injuries severe enough to stop someone starting or finishing the race counted, so it says little about the everyday injuries that derail training blocks. It's a fair caution that a token routine won't save you, not evidence that strength work doesn't work.

Sample microcycles (effort-based, anchored to conversational/threshold/long-run intensity):

Plan type	Early-block week (first ~8 weeks)	Late-block peak
Beginner (24-week, run/walk)	3-4 running days: easy runs ~5 km at 2:1 run/walk, long run building 8→12 km	Long run ~28-32 km; weekly ~40-50 km
Recreational with base (18-week)	4-5 days: easy runs plus one threshold session (~half-marathon effort), long run 16→22 km	Long run ~30-32 km; weekly ~55-70 km

These two rows are illustrative coaching templates, not validated protocols — the same "expert consensus" caveat as the timeline table above applies. The peak figures should be reached gradually over the full block; the progression between the two columns is what the ≤10%-past-your-recent-longest rule governs.

Taper and fueling

The taper

Two independent meta-analyses converge: a 2-week taper cutting volume 41-60%, while holding intensity and frequency steady, is the most efficient strategy to maximize performance (Bosquet et al., 2007; confirmed by Wang et al., PLOS One 2023). Reduce volume only — cutting intensity or frequency erodes the fitness you're trying to protect. Detraining risk shows up after ~14-21 days without any stimulus at all.

Carb-loading

ACSM/Burke consensus: 10-12 g carbohydrate/kg body mass/day for 36-48 hours pre-race (~700-840 g/day for a 70 kg runner). The old 7-day depletion protocol is obsolete — a single high-carb day at ~10 g/kg matches it in trained athletes. Favor low-fiber, refined carbs and some liquid calories across 5-6 meals, largest at lunch the day before.

Race-day fueling

Glycogen fuels only ~90-120 minutes at pace. Consensus is 60-90 g carbs/hour for efforts over 2.5 hours. Anything above ~60 g/h needs multiple transportable carbohydrates — the classic blend is 2:1 glucose:fructose, though more recent work favors a ratio nearer 1:0.8 for the highest rates. Add ~400-800 mL fluid and ~300-600 mg sodium per hour, individualized to sweat rate. First-timers should aim at the lower end (~60 g/h): the 90 g/h figure comes from trained athletes who have deliberately gut-trained for it. Gut tolerance is trainable — practice the exact race-day plan on long runs, not for the first time on race morning.

Injury Risk for First-Time Marathoners

Systematic-review data across 23,047 runners puts pooled running-injury incidence at 26.2%, but that average hides most of the story — it breaks down to 14.9% in novices, 26.1% in recreational runners, and 62.6% in competitive runners, with enormous ranges inside each band (Fredette et al., 2022). Follow-up windows ranged from 1 to 24 months, so no single number is a "per-year" risk. Worth being precise about what that review concluded, since it is often cited as proving training load causes injury: it found conflicting evidence on the association between injuries and specific training parameters. In first-time marathoners specifically, the NYC Marathon trial gives a more directly relevant figure — 8.9% major and 48.5% minor injury across a 12-week build.

The most common issues in first-timers are unspecified knee pain, calf strain, medial tibial stress syndrome, ITB syndrome, and Achilles tendinitis; bone stress injuries are the most serious overuse category. Static stretching shows no injury-prevention benefit in meta-analysis. One cheap biomechanical lever is worth knowing about: increasing step rate by 5-10% at the same pace significantly reduces the mechanical energy absorbed at the knee and hip during the loading phase, with the knee showing the largest absolute reduction (Heiderscheit et al., 2011). That is a lab measurement of joint mechanics in healthy runners on a treadmill — no trial has shown that cueing a higher cadence prevents injuries, so file it as a plausible mechanism, not a proven intervention.

Recovery science, ranked by evidence

Sleep extension has the best evidence of any recovery intervention. Adding roughly 46-113 minutes to reach 8-10 hours nightly improves reaction time, mood, and reduces cortisol; under 6 hours impairs both cognition and recovery (Bonnar et al., 2018). This is the best-supported recovery practice and it's free.

Cold-water immersion reduces acute soreness and perceived fatigue (~10-15 minutes at 11-15°C) — but a controlled 12-week strength-training study found it blunted long-term adaptation: the active-recovery group gained more isokinetic strength (19%), muscle fiber cross-sectional area (17%), and myonuclei per fiber (26%) than the cold-immersion group (Roberts et al., 2015). Save it for acute soreness after a hard race, not routinely after key strength sessions.

Foam rolling and active cool-downs both show small, short-term benefits. A systematic review found foam rolling helps short-term range of motion and soreness but has no meaningful effect on performance recovery or muscle-damage markers (Skinner & Moss, 2020). Active cool-downs clear blood lactate faster but show no proven benefit for next-day soreness or performance (Van Hooren & Peake, 2018). Neither is harmful; neither is a substitute for sleep or a rest day. At least one full rest day per week is standard, more for beginners.

Tracking readiness and progress

Resting heart rate and HRV. A sustained rise over several consecutive mornings can signal incomplete recovery or illness — in a controlled 2-week overload study, nocturnal heart rate rose ~3.2% in runners who ended up overreached, versus a ~2.8% fall in those who adapted normally, and the combination of nocturnal HR, readiness-to-train, and an exercise-derived HR-running index correctly separated the two groups over 85% of the time (Nuuttila et al., 2024). Track HRV as a 7-day rolling trend, not a single morning reading — day-to-day noise is real, and rising HRV alongside fatigue can also signal overreaching, not recovery.

Pace-at-heart-rate — running faster at the same HR, or the same pace at a lower HR — is a robust, low-noise fitness signal and arguably the single best thing to watch week over week.

The acute:chronic workload ratio is not supported as an injury-prediction tool. A Frontiers editorial reviewing the evidence concluded there is "no evidence supporting the use of ACWR in training-load-management systems," citing mathematical flaws in how the ratio couples acute and chronic load (Impellizzeri et al., 2021). Use trend-based load monitoring instead of a rigid ratio threshold.

Race-prediction formulas overshoot the marathon specifically. Riegel's formula (T₂ = T₁ × (D₂/D₁)^1.06) was fitted to record performances across distances (Riegel, 1981) — athletes optimally trained for every distance, which a first-time marathoner is not. It holds up reasonably for adjacent distances but systematically predicts marathon times faster than runners actually achieve, because the exponent doesn't capture glycogen depletion, thermoregulatory drift, or the simple fact that most people's marathon-specific endurance lags their 5K speed. The gap widens the further you extrapolate, which is why a marathon predicted from a 5K is the least trustworthy case of all. Coaches commonly pad a marathon prediction by 3-10%; treat that as a working heuristic rather than a validated correction, since the size of the error depends heavily on your own long-run training.

Feed a recent shorter race into the Race Time Predictor for a rough goal — then pad it, don't trust it literally, for your first marathon.

Subjective wellness tracking can detect problems earlier than heart-rate markers alone. Daily short check-ins on sleep, mood, soreness, and motivation are validated tools (POMS, RESTQ-Sport, Hooper's index) that in overload studies caught overreaching earlier and more reliably than heart-rate markers alone. Overtraining sits on a spectrum — functional overreaching (days to 2 weeks, followed by supercompensation), non-functional overreaching (weeks to months, performance stagnation), and overtraining syndrome (months to years) — per the ECSS/ACSM consensus statement (Meeusen et al., 2013). It's a diagnosis of exclusion with no reliable biomarker; rule out anemia, thyroid dysfunction, and iron deficiency before assuming it's just training load.

The build, stage by stage

Stage 0 — Before you commit. Confirm you can run/walk 30 minutes and have several weeks of 3-4 days/week running behind you. If not, spend 8-12 weeks building that base first. See a physician first if you have known cardiovascular, metabolic or renal disease, any symptoms suggestive of it (chest discomfort, unexplained breathlessness, palpitations, fainting), or a family history of sudden cardiac death.

Stage 1 — Choose your timeline. Sedentary beginner → 24-30 weeks (a half-marathon makes a good interim goal). Comfortable with 5-10 km runs at ~20-30 km/week → 16-20 weeks. Comfortable half-marathoner → 12-16 weeks. Age 40+ → keep the same weeks, add recovery density.

Stage 2 — Build the engine. Keep ~80% of running easy. Grow volume gradually, and treat your longest run of the past 30 days as the ceiling — when you do go past it, keep the step small and don't do it in consecutive weeks. Cap the long run at 25-30% of weekly volume and 2.5-3 hours. Use run-walk from the start if you're a beginner. Add 2-3 strength sessions weekly, heavy and progressive rather than a token 10-minute circuit.

Pain that alters your form, persists past the first mile, or worsens as you run → stop that run. This is the single most actionable rule in the whole plan.

Stage 3 — Practice your race plan. Practice fueling (building toward 60-90 g carbs/hour), hydration, pacing, and gear on long runs. Complete 2-3 long runs of 28-35 km (or ~3 hours) in the final 8 weeks.

Stage 4 — Taper. Cut volume 41-60% over the final 2 weeks; keep intensity and frequency. Prioritize sleep extension. Carb-load 10-12 g/kg/day for the final 36-48 hours.

Stage 5 — Monitor throughout. Track morning RHR, optionally HRV trend, and a daily wellness check. Rising RHR plus falling HRV plus poor wellness plus a stalled pace-at-HR over several days is a reason to reduce training load — insert a recovery week, cut volume, or extend the timeline rather than push through.

How solid is each claim, really?

Topic	Evidence quality	Notes
Taper protocol	Strong (two meta-analyses)	2 weeks, 41-60% volume cut, hold intensity
Carbohydrate strategy	Strong	Well-established sports-nutrition consensus
Strength training → injury	Strong (meta-analytic), for heavy loading	The NYC RCT's null tested a 10-minute self-directed circuit against a narrow endpoint — a different intervention, not a rebuttal
Single-session spike vs. 10% rule	Moderate for the spike, weak for the rule	Large cohort, but observational and not a clean dose-response; no week-to-week ratio effect
Cardiac risk & screening	Strong for incidence, weak for screening accuracy	Absolute risk is very low; standard algorithms miss occult disease
Run-walk strategy	Moderate for soreness, weak for pace (n = 42)	Soreness benefit clear; "same finish time" is an underpowered null, not proven equivalence
Cadence increase	Mechanistic only	Reduces knee/hip energy absorption in the lab; no injury-outcome trial
Training-duration-by-population ranges	Weak / expert consensus	No RCT has ever randomized runners to different prep timelines
Sleep extension	Strong	Best-evidenced recovery lever available
Cold-water immersion, foam rolling, cool-downs	Moderate-weak	Small acute effects; some evidence CWI blunts long-term strength adaptation
ACWR for injury prediction	Debunked	Mathematically flawed; avoid rigid ratio thresholds
Race-time prediction for the marathon	Weak for the marathon	Riegel was fitted to record performances; over-predicts for first-timers, worst when extrapolated from a 5K
Intensity distribution for novices	Weak — untested in beginners	"Mostly easy" is solid; pyramidal vs. polarized was only compared in experienced marathoners, with ~18% non-responders

Caveats worth keeping in mind

Individual variability is large: in the 2025 intensity-distribution trial, 17.9% of runners improved on neither plan they could have been assigned, and roughly a third did better on the one they weren't given (Qin et al., 2025). There is no universal prescription, and group-average results are useful context, not an individual prescription.

Two structural limits are worth stating plainly. Nearly all the injury evidence here is observational — cohorts can show that runners who spike a session get hurt more often, but not that the spike caused it, since feeling good enough to run long and being about to break down are hard to disentangle. And almost none of it was collected in first-time marathoners specifically; the best-matched study in this article, the NYC Marathon trial, is one trial with a narrow endpoint.

A "pass" on medical screening is reassuring, not a guarantee. And some of the most quoted figures here (sample schedules, pace anchors, the 20-mile long run) come from coaching consensus rather than primary literature — labeled as such throughout, but worth remembering when a plan states a number with more confidence than the evidence actually has.

The takeaway

Your first marathon isn't really a fitness test — your cardiovascular system will be ready long before race day arrives. It's a test of tissue tolerance, race execution, and patience. Respect the slower timeline: build gradually, cap the long run, lift twice a week, never spike a single run past your recent longest, taper for real, and practice your fueling before you need it. Do that, and finishing becomes much more predictable.

Not sure you're ready to start the marathon-specific block yet? Build your base first — and once you're training, nail your paces, set your zones with the Heart Rate Zone Calculator, rehearse your splits with the Race Strategy Calculator, and let the Runima app track the trend — pace at a given heart rate — that tells you the training is actually working.

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This article is for general education and isn't medical advice. If you're new to distance running, returning from injury, or managing a health condition, clear a marathon build-up with your clinician before you increase volume or intensity.