Where the model comes from
Baseload builds on tools drawn from the sports medicine and sports science literature on the load ↔ injury relationship — in particular the work on the acute-to-chronic workload ratio (Gabbett, 2016 & 2020). The core idea is simple: it's not high load that injures you, it's the too-rapid increase in load relative to what your body has learned to absorb.
These models describe population trends, not an individual prediction. Baseload uses them as a compass: to tell you when the slope is getting risky and to propose an explainable adjustment — never as a guarantee that you won't get injured.
No model replaces how you feel or medical advice. Baseload helps you decide, it doesn't decide for you. If you have pain that persists, see a professional. Baseload is not a substitute for medical advice — see our terms of use.
Everything stays on your iPhone
Everything you'll read here is computed locally, on your device. Your health data isn't sent to a server: no raw heart rate, no GPS track, no full session ever leaves the iPhone. No mandatory account, no email, no tracking SDK. The page on the model goes into detail on this.