The science behind Godwit
Every number in Godwit comes from published sports science and is worked out by tested code. Godwit doesn’t claim any one method is right; in the app, each result names its method and what it rests on. Every measure here is free, and always will be.
| Measure | What it tells you | Based on |
|---|---|---|
| Training load | How hard each session was, from your heart rate. | Based on: Banister model |
| Fitness | The training you’ve absorbed over about six weeks. Also called chronic training load. | Based on: Banister model |
| Fatigue | What the last week has taken out of you. Also called acute training load. | Based on: Banister model |
| Form | Fitness minus fatigue: how fresh you are. Also called training stress balance. | Based on: Banister model |
| Your usual | The normal range for your own body, learned from your recent weeks. | Based on: Your history |
| Readiness | This morning’s HRV, resting heart rate and sleep against your usual, when your files include them. | Based on: Your history |
| Race estimate | Your likely time at a new distance. It uses the standard exponent until you’ve raced two distances far enough apart, then fits your own. | Based on: Riegel’s formula |