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# runningPower

A quantity sample type that measures the rate of work required for the runner to maintain their speed.

```
static let runningPower: HKQuantityTypeIdentifier
```

## Discussion

These samples use power units (described in [`HKUnit`](/documentation/HealthKit/HKUnit)) and measure discrete values (described in [`HKQuantityAggregationStyle`](/documentation/HealthKit/HKQuantityAggregationStyle)). During outdoor running workouts, the system automatically records running power samples on Apple Watch SE and Series 6 and later. Sample data may be condensed and/or coalesced by HealthKit. For more information, see <doc://com.apple.healthkit/documentation/HealthKit/accessing-condensed-workout-samples>.

## See Also

[`HKQuantityTypeIdentifierAppleWalkingSteadiness`](/documentation/HealthKit/HKQuantityTypeIdentifier/appleWalkingSteadiness)

A quantity sample type that measures the steadiness of the user’s gait.

[`HKCategoryTypeIdentifierAppleWalkingSteadinessEvent`](/documentation/HealthKit/HKCategoryTypeIdentifier/appleWalkingSteadinessEvent)

A category sample type that records an incident where the user showed a reduced score for their gait’s steadiness.

[`HKQuantityTypeIdentifierSixMinuteWalkTestDistance`](/documentation/HealthKit/HKQuantityTypeIdentifier/sixMinuteWalkTestDistance)

A quantity sample type that stores the distance a user can walk during a six-minute walk test.

[`HKQuantityTypeIdentifierWalkingSpeed`](/documentation/HealthKit/HKQuantityTypeIdentifier/walkingSpeed)

A quantity sample type that measures the user’s average speed when walking steadily over flat ground.

[`HKQuantityTypeIdentifierWalkingStepLength`](/documentation/HealthKit/HKQuantityTypeIdentifier/walkingStepLength)

A quantity sample type that measures the average length of the user’s step when walking steadily over flat ground.

[`HKQuantityTypeIdentifierWalkingAsymmetryPercentage`](/documentation/HealthKit/HKQuantityTypeIdentifier/walkingAsymmetryPercentage)

A quantity sample type that measures the percentage of steps in which one foot moves at a different speed than the other when walking on flat ground.

[`HKQuantityTypeIdentifierWalkingDoubleSupportPercentage`](/documentation/HealthKit/HKQuantityTypeIdentifier/walkingDoubleSupportPercentage)

A quantity sample type that measures the percentage of time when both of the user’s feet touch the ground while walking steadily over flat ground.

[`HKQuantityTypeIdentifierStairAscentSpeed`](/documentation/HealthKit/HKQuantityTypeIdentifier/stairAscentSpeed)

A quantity sample type measuring the user’s speed while climbing a flight of stairs.

[`HKQuantityTypeIdentifierStairDescentSpeed`](/documentation/HealthKit/HKQuantityTypeIdentifier/stairDescentSpeed)

A quantity sample type measuring the user’s speed while descending a flight of stairs.


---

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