ComboPower

ComboPower estimates your running power and VO2max in real time — no external power meter required. How it works ComboPower combines three physics-based power components using your GPS speed, elevation, and heart rate: - Rolling resistance — your weight and pace - Air drag — your speed relative to the wind (set your local wind speed and direction as a field setting for more accurate results) - Climbing power — the current grade, with an efficiency correction for steep uphill/downhill The result is smoothed in real time and shown alongside your session and lap averages, plus a live VO2max estimate corrected for ambient temperature. What you see - POWER — current estimated power (W) - AVG P — session average power (W) - LAP P — lap average power (W) - VO2MAX — live VO2max estimate (ml/kg/min) After your activity Power and VO2max are written directly to your FIT file, so they show up in Garmin Connect and any FIT-compatible analysis tool. Setup Enter your weight in the data field settings (two fields: tens + ones digit, e.g. 7 and 2 for 72 kg) — that's it. No pairing, no external sensors. Please note ComboPower's power values are a physics-based *estimate* derived from GPS speed, elevation, and heart rate — not a direct force/torque measurement from a dedicated power meter. Accuracy depends on GPS signal quality and course conditions (tunnels, dense tree cover, or erratic GPS will affect the estimate).

Version 2.1 • A single, anonymous "activated" signal (no personal data) is sent the first time the app is opened, purely so the developer knows the app is in use Full privacy policy and disclaimer available at inaki-martinez-de-lizarrondo.netlify.app/combopower#privacy