<!--
{
  "availability" : [
    "iOS: 17.0.0 -",
    "iPadOS: 17.0.0 -",
    "macCatalyst: 17.0.0 -",
    "macOS: 14.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 10.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "HealthKit",
  "identifier" : "/documentation/HealthKit/HKQuantityTypeIdentifier/physicalEffort",
  "metadataVersion" : "0.1.0",
  "role" : "Type Property",
  "symbol" : {
    "kind" : "Type Property",
    "modules" : [
      "HealthKit"
    ],
    "preciseIdentifier" : "c:@HKQuantityTypeIdentifierPhysicalEffort"
  },
  "title" : "physicalEffort"
}
-->

# physicalEffort

A quantity sample type that measures the estimated amount of energy being used to perform a task excluding other factors such as temperature, altitude, or heart rate.

```
static let physicalEffort: HKQuantityTypeIdentifier
```

## Discussion

These samples use power in Metabolic Equivalent of Task (METs) units (described in [`HKUnit`](/documentation/HealthKit/HKUnit)) and measure discrete values (described in [`HKQuantityAggregationStyle`](/documentation/HealthKit/HKQuantityAggregationStyle)). Physical effort is estimated and recorded automatically by Apple Watch.

## See Also

[`HKMetadataKeyAverageMETs`](/documentation/HealthKit/HKMetadataKeyAverageMETs)

A key that indicates the average Metabolic Equivalent of Task (METs) during a workout.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)