---
title: HKMetadataKeyFitnessMachineDuration
framework: healthkit
role: symbol
role_heading: Global Variable
path: healthkit/hkmetadatakeyfitnessmachineduration
---

# HKMetadataKeyFitnessMachineDuration

The workout duration displayed by a connected GymKit fitness machine.

## Declaration

```swift
let HKMetadataKeyFitnessMachineDuration: String
```

## Discussion

Discussion Set this key on a workout sample representing exercise on a GymKit fitness machine. Set its value to an HKQuantity object with a time unit.

## See Also

### GymKit Fitness Equipment

- [HKMetadataKeyCrossTrainerDistance](healthkit/hkmetadatakeycrosstrainerdistance.md)
- [HKMetadataKeyIndoorBikeDistance](healthkit/hkmetadatakeyindoorbikedistance.md)