Apple Watch Running Power Alternative

Apple Watch estimates running power in watts using its built-in accelerometer, barometer, and GPS to model the mechanical work your body performs while running. It calculates power by analyzing vertical oscillation, pace changes, and elevation gain without requiring a chest strap or foot pod — the motion sensors approximate ground reaction forces from wrist movement patterns. The metric is displayed as instantaneous power, lap averages, and configurable rolling averages during workouts. Power data is stored in Apple Health and can be viewed post-run as a time-series alongside heart rate, pace, and cadence.