Apple’s GymKit feature, which launched in 2017 as a seamless way to connect the Apple Watch to compatible gym equipment, is getting a significant upgrade with iOS 27. For the first time, users can leverage GymKit without wearing an Apple Watch at all. Instead, the combination of an iPhone and AirPods Pro 3 can replicate the entire gym-tracking experience, turning the treadmill into a data-rich workout machine that syncs directly with the Fitness app.

The Evolution of GymKit

When Apple introduced GymKit, it solved a persistent problem for fitness enthusiasts: the disconnect between wearable data and gym equipment metrics. The Apple Watch could track heart rate and calories, but only the treadmill or elliptical knew exact distance, incline, and machine-specific calorie calculations. GymKit bridged that gap by allowing a simple NFC tap to pair the watch with the machine, enabling real-time data exchange. Over the years, the feature has become a staple for many gym-goers, especially those who value accurate workout logging.

With iOS 27, Apple is expanding that capability beyond the watch. The new version of GymKit works with iPhone and AirPods Pro 3, which for the first time include built-in heart-rate sensors. This means that even if you forget your Apple Watch at home or your watch battery dies before a workout, you can still enjoy the precision of machine-connected tracking. The setup is straightforward: tap your iPhone to the NFC reader on compatible equipment, select your workout type (such as Indoor Walk or Indoor Run), and start moving. The treadmill then receives heart-rate data from your AirPods, while your iPhone captures distance, pace, incline, and calorie data from the machine.

How the New System Works

The process begins with a simple NFC tap. Once the iPhone is paired, the machine’s console displays a confirmation, and the workout starts. The heart-rate data flows from the AirPods Pro 3 to the treadmill, which uses it to calculate more accurate calorie burn. Simultaneously, the treadmill sends back precise metrics that the iPhone cannot determine on its own — such as the exact belt distance traveled and the incline level. This combined data stream is then stored privately on the iPhone and removed from the equipment after the session ends, preserving user privacy.

Early testing with iOS 27 beta 1 reveals that the integration works smoothly. In a 16-minute treadmill walk, the system recorded 0.66 miles, 65 active calories, 97 total calories, 32 feet of elevation gain, and an average heart rate of 115 BPM — exactly as if an Apple Watch had been used. The workout appeared in the Fitness app with all the correct details, and the Exercise ring updated retroactively once the Apple Watch was worn again, syncing the data.

AirPods Pro 3 as the Heart-Rate Source

AirPods Pro 3 represent a significant leap forward for Apple’s wearable ecosystem. They are the first AirPods to include optical heart-rate sensors, a feature previously tested with Powerbeats Pro 2. In the context of GymKit, these sensors replace the Apple Watch’s heart-rate monitor. The AirPods continuously track your pulse during the workout and transmit it to the treadmill via the iPhone’s connection. This eliminates the need to grasp metal contacts on the machine or wear a separate Bluetooth chest strap.

Users must ensure that heart-rate permissions are enabled for their AirPods in the Settings app. In testing, disabling this permission caused the iPhone to disconnect from the treadmill as soon as the workout started, because no heart-rate source was available. Conversely, leaving the permission on ensures that the AirPods can also work with an Apple Watch for even more accurate data, as the watch can draw from multiple sensors.

Practical Benefits and Limitations

The new GymKit experience is particularly useful in scenarios where the Apple Watch is unavailable. For example, if you accidentally leave your watch at home, charge it during a lunch break, or simply prefer not to wear it for certain workouts, the iPhone and AirPods combination provides a reliable fallback. It also serves as a low-cost entry point for users who own an iPhone and AirPods but are considering an Apple Watch — they get a taste of the integrated fitness tracking without needing to buy a watch immediately.

However, there are limitations. The setup requires both an iPhone and AirPods Pro 3; without the AirPods, the system fails because there is no heart-rate source. Additionally, if you are wearing an Apple Watch, the iPhone defaults to directing you to the Workout app on the watch, though you can override this choice. The Exercise ring on the watch does not update in real time during the workout when using only the iPhone, but it catches up once the watch is back on and synced.

Broader Fitness Strategy

This update is part of Apple’s ongoing effort to make the Fitness app more capable without requiring an Apple Watch. iOS has gradually added more fitness features over the years, including the ability to track steps and workouts using the iPhone’s sensors and the introduction of Fitness+ as a service that works with both iPhone and Apple Watch. AirPods Pro 3’s heart-rate tracking pushes this further, and iOS 27 brings the pieces together in a cohesive manner.

GymKit on iPhone also aligns with the improved treadmill tracking in watchOS 27, which makes the Apple Watch more accurate on its own. Yet GymKit remains the gold standard for precision because it uses the machine’s own sensors for distance and incline. For users who want the best possible data, GymKit via iPhone and AirPods is now a viable alternative to wearing the watch.

Implications for Fitness Enthusiasts

The ability to log a gym workout with real machine metrics and real heart rate without an Apple Watch is a game-changer for those who occasionally forget their watch or want to simplify their gear. It also enhances the value proposition of AirPods Pro 3, which already excel in audio quality and noise cancellation. For gym equipment manufacturers, this expansion could drive more adoption of GymKit compatibility, as the user base now extends beyond Apple Watch owners to include all iPhone users with the latest AirPods.

Privacy remains a key aspect: all workout data is stored on the iPhone and removed from the gym equipment upon completion. This ensures that personal health data does not remain on shared machines. Users can manage their health data through the Health app and control which apps and devices have access to heart-rate information.

In practice, the feature works best with treadmills and other cardio equipment that support GymKit. Ellipticals, stair steppers, and stationary bikes are also likely to be compatible, though the initial testing focused on treadmills. As iOS 27 moves through beta and into a public release later this year, more detailed information about supported equipment and additional workout types may emerge.

The combination of iPhone and AirPods Pro 3 for GymKit represents a thoughtful extension of Apple’s fitness ecosystem. It acknowledges that users have diverse needs and circumstances, and it provides a flexible solution that leverages the hardware many already own. Whether as a primary tracker or a backup option, this new capability makes the gym experience more seamless and data-rich without requiring an additional wearable.

Source:9to5Mac News