---
title: "workoutBuilder(_:didBegin:)"
framework: healthkit
role: symbol
role_heading: Instance Method
path: "healthkit/hkliveworkoutbuilderdelegate/workoutbuilder(_:didbegin:)"
---

# workoutBuilder(_:didBegin:)

Tells the delegate that a new workout activity has started.

## Declaration

```swift
optional func workoutBuilder(_ workoutBuilder: HKLiveWorkoutBuilder, didBegin workoutActivity: HKWorkoutActivity)
```

## Parameters

- `workoutBuilder`: The workout builder that received the new activity.
- `workoutActivity`: A new workout activity, currently in progress.

## See Also

### Receiving activity updates

- [workoutBuilder(_:didEnd:)](healthkit/hkliveworkoutbuilderdelegate/workoutbuilder(_:didend:).md)