Apple extends GymKit to iPhone and AirPods Pro 3 with iOS 27

GymKit works by tapping an Apple Watch against a machine to enable two-way syncing: the equipment displays what the watch measures, and the watch uses the machine's metrics to refine workout calculations. Under iOS 27, the iPhone takes over the display-and-record role while AirPods Pro 3 supply live heart rate data, which the phone passes to the equipment; the machine then sends workout details to the Fitness app. Apple's GymKit privacy page states that workout information is removed from the connected equipment when a session ends, unless the user is on a machine they have signed into.

Connecting works like paying at a store with a phone, according to Engadget: tap the iPhone on the GymKit or NFC contact point, choose a workout type and start the session. Apple lists treadmills, ellipticals, bikes and stair steppers among the supported cardio equipment, and compatibility may extend to other units.

The requirements on the equipment side have not changed. A cardio machine still needs Apple's GymKit integration whether the session is run from an Apple Watch or an iPhone; iOS 27 only adds the same tap-to-connect option for the phone, using its NFC reader instead of the watch's. Without GymKit on the machine, the iPhone and AirPods Pro 3 still handle ordinary workout tracking, but no data moves between the phone and the equipment.

That dependence on GymKit hardware remains the biggest obstacle, as it has been since 2017. Fitness equipment turns over slowly, home machines keep getting more expensive, and many of the units found in commercial gyms and home setups do not carry the integration.

Other limits apply. The iPhone must be updated to iOS 27, and heart rate tracking requires AirPods Pro 3. As of the Engadget report, GymKit-supported machines will disconnect from an iPhone if the earbuds are not part of the session.

Engadget notes that the new setup does not fully replace the Apple Watch. The wearable supplies all-day, all-night data that frames daily workouts, which a phone-plus-earbuds pairing does not cover. The iPhone and AirPods Pro 3 provide the data a single session realistically needs, making them useful for users who do not own a watch, leave it at home or forget to charge it. Given the need to carry both phone and earbuds, though, a charged and ready Apple Watch remains the more convenient option.

Editor's Summary

Apple has brought GymKit to the iPhone through iOS 27, pairing the phone with AirPods Pro 3 for heart rate data and tap-to-connect syncing with compatible cardio machines. The update gives users without a charged Apple Watch a way to log equipment data into the Fitness app, but it still requires GymKit-enabled machines, which remain uncommon in gyms and homes.