HKQuantityTypeIdentifierRunningPower — reading running power from Apple Health
HKQuantityTypeIdentifierRunningPower reports watts, and watts from a wrist are not the watts a foot pod means.
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A model, wearing a familiar unit
Running power is not measured the way cycling power is. Apple estimates it from Watch motion; Stryd measures it at the foot. Both output watts, and that shared unit is a trap: the numbers come from different models and are not interchangeable. Putting Apple’s 280 W beside a foot pod’s 280 W and calling them equal is the same error as comparing two vendors’ sleep scores — a unit match is not a quantity match.
Useful within one device, not across two
None of that makes the number worthless. Within a single wrist over time it tracks effort honestly: your climbing intervals read higher than your recovery jog, and a build in fitness shows up as more speed for the same watts. What it cannot do is settle an argument between two devices, or feed a training model calibrated on a different power source. The rule is the one running through this whole site — compare a metric to itself over time, not to a differently-derived number that happens to share a unit.
What you get from this page
This page reads your running-power series out of the export, in watts, with timestamps, on your device. It shows the shape of it — the surges and the settling — rather than a single headline figure, because the shape is the part that carries information when the absolute level is model-dependent.
This identifier is one of dozens. The Apple Health data dictionary lists every identifier this parser reads, with its canonical type and unit.