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# init(activityType:start:end:)

Instantiates a new workout.

```
convenience init(activityType workoutActivityType: HKWorkoutActivityType, start startDate: Date, end endDate: Date)
```

## Parameters

`workoutActivityType`

The type of activity being performed during the workout. For a list of possible activity types, see [`HKWorkoutActivityType`](/documentation/HealthKit/HKWorkoutActivityType).

`startDate`

The date and time when the activity started.

`endDate`

The date and time when the activity ended. This date must be equal to or later than the start date.

## Return Value

A workout activity.

## Discussion

The workout’s duration is calculated from its start and end times. The workout’s total distance, total energy burned, workout events, device, and metadata are all set to `nil`.

```swift
let basketball = HKWorkout(activityType:HKWorkoutActivityType.Basketball,
                           startDate: start, endDate: end)
 
 
healthStore.saveObject(basketball) { (success, error) -> Void in
    guard success else {
        // Perform proper error handling here...
        fatalError("*** An error occurred while saving this " +
            "workout: \(error?.localizedDescription)")
    }
}
```

## See Also

[`workoutActivityType`](/documentation/HealthKit/HKWorkout/workoutActivityType)

The type of activity performed during the workout.

[`totalDistance`](/documentation/HealthKit/HKWorkout/totalDistance)

The total distance traveled during the workout.

[`duration`](/documentation/HealthKit/HKWorkout/duration)

The workout’s duration.

[`metadata`](/documentation/HealthKit/HKObject/metadata)

The metadata for this HealthKit object.

[`totalEnergyBurned`](/documentation/HealthKit/HKWorkout/totalEnergyBurned)

The total active energy burned during the workout.

[`workoutEvents`](/documentation/HealthKit/HKWorkout/workoutEvents)

An array of workout event objects.


---

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