Fitness Simulator
Simulate your fitness build over weeks — plan your season with real numbers.
Configure Simulation
Weekly Load
Fitness Curve over Simulation Period
Weekly Breakdown
| Week | Load | Fitness (end) | Change | Load Zone |
|---|
Track Real Fitness from Strava
WattRun calculates your fitness automatically from your activities — updated daily with fatigue and form.
Start for free →Free · No subscription
What now?
You now know your number. What do you do with it?
Data is free — the daily decision isn't. WattRun builds a plan around your number, fits it to your real week and tells you what to do today — with a reason, not just charts.
For cycling and running · tell us in 15 seconds how you feel