Analyze your treadmill HRmax trainings.
Get a laboratory-style PDF report. Free and local-only.
Upload your training FIT file.
Drag and drop or click browse. Your file is processed locally.
This tool evaluates maximum-effort protocols performed on a treadmill. By analyzing the underlying R-R intervals of your .fit file locally in your browser, it estimates your VO₂max, computes metabolic thresholds via DFA and checks your autonomic recovery dynamics.
Important: Manually lap during training marking the maximum-effort protocol start, end and each change in speed or incline.

Record your session
- 1Wear an accurate chest strap, like the Polar H10.
- 2Mark the start: Hit Lap exactly when your ramp protocol begins.
- 3Mark every change: Hit Lap every time you change treadmill speed or incline.
- 4Mark your limit: Hit Lap once you hit total exhaustion and stop running.
Record your recovery: Keep recording for at least 2 full minutes while walking slowly or standing still.
How it works
Various methods are used to ensure the most accurate estimate of your VO₂max. Summary: First, artifacts are filtered out using adaptive window median filtering and cubic spline interpolation to subsequently determine DFA values. These metabolic thresholds are combined with mechanical equations (ACSM, Foster Correction, ...) to calculate a personalized VO₂max value.
Read the full specification