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# cyclingFunctionalThresholdPower

A quantity sample type that measures the estimated maximum average power sustained while riding a bike for 60 minutes.

```
static let cyclingFunctionalThresholdPower: HKQuantityTypeIdentifier
```

## Discussion

Cycling Functional Threshold Power (FTP) is an estimate of the maximum average power you can sustain for 60 minutes while riding a bike. These samples use power units (described in [`HKUnit`](/documentation/HealthKit/HKUnit)) and measure discrete values (described in [`HKQuantityAggregationStyle`](/documentation/HealthKit/HKQuantityAggregationStyle)). During cycling workouts, the system automatically records estimated FTP samples on Apple Watch.

---

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