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Running Progression Calculator Running Pace Calculator Race Time Predictor Race Strategy Calculator Race Pace Calculator Heart Rate Zone Calculator Training Pace Calculator Running Calorie Calculator Strength Training Plan GeneratorAm I actually getting faster? Is this training load safe? When should I race? My watch tracked everything but answered nothing. So I built the tool I was looking for.
A year ago, I started taking running more seriously. I followed a training plan, set goals and recorded every run with my Garmin. I had pace, heart rate, steps per minute and sleep scores, but I did not know what to do with them.
The charts showed individual runs. I wanted to understand changes across weeks: how my effort compared with my usual training, how my results were changing and what to review before the next race.
As a software developer, I started with a spreadsheet and my exported running files. I used the Banister model to track training load and the Daniels-Gilbert formula to estimate race times. I also compared recent load with usual load, using the acute:chronic workload ratio (ACWR). That ratio cannot tell me whether a run will cause an injury.
I could see changes in training load and notice unusually long runs. The numbers helped me review race preparation and discuss my plan with a coach. They did not tell me whether I was ready to race or safe from injury.
That spreadsheet became Runima. I built it for runners who want to understand their training, not only record it.
Garmin Connect shows you what happened. Strava shows you who's watching. TrainingPeaks charges you $120/year. None of them answer the question that matters: what should I do next?
| Feature | Runima | Garmin Connect | Strava | TrainingPeaks |
|---|---|---|---|---|
| Activity Logging | ✓ | ✓ | ✓ | ✓ |
| Progression Analysis | ✓ | Basic | Premium | ✓ |
| CTL/ATL/TSB (Fitness/Fatigue/Form) | ✓ | Basic | Premium | ✓ |
| Recent vs usual training load (ACWR) | ✓ | — | — | — |
| HRV + Sleep Recovery Analysis | ✓ | Separate | — | — |
| Daily Readiness Score | ✓ | Premium devices | — | — |
| VO₂max Race Strategy Planner | ✓ | Basic | — | — |
| Transparent Methodology | ✓ | — | — | — |
| Price | Free (early access) | Free | $80/yr | $120/yr |
| Ease of Use | Simple | Simple | Simple | Complex |
Every metric in Runima comes from peer-reviewed research. I just made them accessible — every formula documented, every threshold cited, no black boxes.
CTL/ATL/TSB — The gold standard for tracking fitness, fatigue, and form. Developed by Dr. Eric Banister and used by Olympic coaches to time peak performance for competition.
ACWR — A comparison of recent training with my longer-term average. Useful context alongside session distances and recovery, rather than an injury prediction or a target I must stay inside.
Evidence-based training paces — Dr. Jack Daniels' formula converts your VO₂max into the exact paces you should be running for each workout type. No guessing. No ego-pacing.
HRV readiness scoring — Your nervous system's honest assessment of recovery. High HRV means you're recovered and ready for intensity. Low HRV means your body is still processing yesterday's effort.
These are my own results, not a test proving that Runima works. Training, weather and recording errors can affect the numbers. They do not prove that the app caused progress or prevented injury.
I followed my watch's fitness estimates over time.
Over 12 monthsMy half-marathon pace changed during structured training.
Over 6 monthsMy recorded setbacks, not proof that a load score prevents injury.
Last 12 monthsMy resting heart rate fell during this period.
Over 3 monthsYou do not need to be an elite runner to use your data. Review your training whether you are preparing for a race, returning after a break or building a regular running habit.
Prepare for your first or fastest marathon. Review long runs, training load and recent results when planning your next race.
Work towards a personal best, qualifying time or race placing. Compare your training and results to decide what to work on next.
Move beyond spreadsheets without losing the detail. See the recorded data, calculations and limits behind each analysis.
Review changes in training load and run distance. Use them to support a conversation, not to predict injury or replace medical advice.
Review your past training with a coach or health professional. After injury, a load score cannot tell you when it is safe to return.
Keep using your watch. Import supported files to compare your runs and track changes over time.
The name is a small piece of Spanish wordplay. Two words sit inside it: build your core and keep your spirits up while you do it. That's the whole idea behind Runima.
Your aerobic engine, your base, the foundation everything else is built on. Runima is here to help you grow it — patiently, on the strength of real data.
The word you'll hear shouted from the crowd at any marathon in the Spanish-speaking world. Encouragement, mid-effort, exactly when you need it most.
Runima is in early access. The features are real, the analytics are live, and it's completely free. Every early user helps shape what comes next — and keeps early-access pricing even if we introduce paid plans later. If you've ever thought "I wish this tool existed" — it does now.
Free during early access · no credit card · import your data in 2 minutes