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# handle(_:)

Tells the delegate that the user started a workout session on the paired iPhone.

```
optional func handle(_ workoutConfiguration: HKWorkoutConfiguration)
```

## Parameters

`workoutConfiguration`

The workout configuration data. You can use this information to start a workout session on the user’s Apple Watch.

## Discussion

When your iPhone app starts a workout session using the HealthKit store’s `startWatchAppWithWorkoutConfiguration:completion:` method, the system launches or wakes the corresponding Watch app in the background and calls this method. Use this method to configure an <doc://com.apple.documentation/documentation/HealthKit/HKWorkoutSession> object in your Watch app, and then call <doc://com.apple.documentation/documentation/HealthKit/HKHealthStore/start(_:)> to start the session.

---

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