<!--
{
  "availability" : [
    "iOS: 27.0.0 -",
    "iPadOS: 27.0.0 -",
    "macCatalyst: -",
    "macOS: 27.0.0 -",
    "visionOS: 27.0.0 -",
    "watchOS: 27.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "HealthKit",
  "identifier" : "/documentation/HealthKit/HKWorkoutZone",
  "metadataVersion" : "0.1.0",
  "role" : "Structure",
  "symbol" : {
    "kind" : "Structure",
    "modules" : [
      "HealthKit"
    ],
    "preciseIdentifier" : "s:9HealthKit13HKWorkoutZoneV"
  },
  "title" : "HKWorkoutZone"
}
-->

# HKWorkoutZone

A structure that represents a single zone with defined thresholds for a quantity type.

```
struct HKWorkoutZone
```

## Overview

The system creates workout zones as part of an [`HKWorkoutZoneConfiguration`](/documentation/HealthKit/HKWorkoutZoneConfiguration). This structure defines the minimum and maximum values that determine when a quantity type measurement falls within the zone. For example, a heart rate zone might have a minimum of 136.8 beats per minute and a maximum of 147.6 beats per minute.

## Topics

### Accessing zone properties

[`let index: Int`](/documentation/HealthKit/HKWorkoutZone/index)

The zero-based index of the zone within the containing zone configuration, ordered from lowest to highest threshold.

[`var minimum: HKQuantity?`](/documentation/HealthKit/HKWorkoutZone/minimum)

The minimum threshold for the zone.

[`var maximum: HKQuantity?`](/documentation/HealthKit/HKWorkoutZone/maximum)

The maximum threshold for the zone.

## Relationships

### Conforms To

[`Sendable`](/documentation/Swift/Sendable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)