GymKit has been one of the Apple Watch's most intelligent fitness features since its debut in 2017. The system allows users to tap their wearable to compatible gym equipment, sharing heart rate data while receiving machine-generated metrics such as distance, incline, pace, and calorie burn. With the release of iOS 27, Apple is expanding this concept beyond the Apple Watch, enabling a similar experience using just an iPhone and AirPods Pro 3. This development marks a significant shift in Apple's fitness ecosystem, making advanced workout tracking accessible to a broader audience.
How GymKit Works Without the Watch
The setup process is remarkably straightforward. In testing with iOS 27 beta 1, a user simply tapped their iPhone against a GymKit-compatible treadmill. The phone prompts the user to select an activity type – either Indoor Walk or Indoor Run – and then the workout begins from the treadmill's console. Once started, the treadmill receives heart-rate data from the AirPods Pro 3, which are equipped with Apple's latest optical heart-rate sensor. Simultaneously, the Fitness app on the iPhone receives the treadmill's distance, pace, incline, and calorie data. All workout information is stored privately on the iPhone and automatically removed from the equipment after the session ends, maintaining the same privacy standards that GymKit has always enforced.
The Role of AirPods Pro 3
The AirPods Pro 3 are central to this new functionality. These earbuds, released alongside iOS 27, are the first AirPods to include heart-rate tracking capabilities. Apple had previously tested this feature with the Powerbeats Pro 2, which launched earlier in 2026. The sensor in the AirPods Pro 3 uses green and infrared LEDs to measure blood flow through the skin of the ear canal, providing continuous heart-rate data during workouts. This is a notable advancement because it eliminates the need for a chest-strap heart-rate monitor or the awkwardness of gripping metal contacts on gym equipment. Users can manage heart-rate permissions in the Settings app under their AirPods settings and privacy options, offering control over when the sensor is active. In testing, having this permission enabled was crucial; attempting to use GymKit on iPhone without AirPods resulted in the connection dropping because the system lacked a heart-rate source.
Comparison with Apple Watch
While the iPhone and AirPods combination provides a compelling alternative, it does not fully replicate the Apple Watch experience. Apple Watch users benefit from watchOS 27's improved treadmill tracking algorithms, which are even more accurate than previous versions. However, GymKit remains the gold standard for data precision because it directly incorporates machine-calibrated metrics. The key advantage of the new setup is convenience: if your Apple Watch is dead, charging, or left at home, the iPhone and AirPods combination can still log a complete treadmill workout with real heart-rate data and genuine machine metrics. In beta testing, the Exercise ring on the Apple Watch did not update during the workout, but after the user put their watch back on later, the ring caught up and the workout appeared in the Fitness app with the correct data, including distance, calories, and heart rate.
Broader Implications for Apple's Fitness Strategy
This expansion fits into Apple's long-term strategy of making fitness tracking more accessible. Apple first made the Fitness app useful without an Apple Watch when it launched Apple Fitness+, allowing iPhone users to follow guided workouts and close their Move ring. The introduction of heart-rate tracking in AirPods Pro 3 furthered this trend, and iOS 27 ties these components together into a cohesive experience. The decision to bring GymKit to iPhone and AirPods is likely intended to serve as both a backup solution for existing Apple Watch owners and a gateway for potential new customers. Users who experience the convenience of accurate treadmill tracking without a watch may be more inclined to purchase an Apple Watch in the future, especially if they appreciate the holistic health data that the wearable provides.
Furthermore, the integration addresses common pain points at the gym. Many users find it inconvenient to hold onto the metal heart-rate contacts on treadmills and ellipticals, and Bluetooth chest straps are often uncomfortable or require separate charging. AirPods Pro 3 solve both issues by offering heart-rate monitoring directly from the ears while also serving as the audio source for music or podcasts. The iPhone becomes the central computer, displaying real-time workout data on its screen, which can be mounted on the treadmill's device holder.
Technical Details and Limitations
The implementation relies on the same NFC-based tap that GymKit has used since its inception. However, there are some limitations to be aware of. If the user attempts to start a GymKit session on iPhone while wearing an Apple Watch, iOS will prompt the user to use the Workout app on the watch instead, though it is possible to continue without the watch. Additionally, the feature currently only supports compatible gym equipment, which includes treadmills, ellipticals, stair steppers, and stationary bikes from brands like Technogym, Life Fitness, and Matrix. The accuracy of heart-rate data from AirPods Pro 3 has been tested against chest straps and shows strong correlation, though it may be slightly less responsive during high-intensity intervals. Apple continues to refine the algorithms with each software update.
Expanding the Fitness Ecosystem
iOS 27 also introduces other fitness-related enhancements, but the GymKit expansion is arguably the most impactful for gym-goers. The ability to leave the Apple Watch at home on days when it is not charged is a practical benefit that many users will appreciate. For individuals who do not own an Apple Watch but have an iPhone and AirPods Pro 3, this feature offers a level of workout tracking that was previously unavailable. It also demonstrates Apple's commitment to creating a cohesive ecosystem where different devices can substitute for one another without sacrificing data quality. As more gym equipment manufacturers adopt GymKit compatibility, the utility of this feature will only grow.
The Fitness app on iOS 27 has also been updated to better display data from these sessions, offering detailed graphs and summaries similar to those seen after an Apple Watch workout. Users can view metrics such as average heart rate, cadence, and elevation gain over time, all synchronized across devices via iCloud. This ensures that the workout history is complete regardless of which device was used to capture it.
Privacy and Data Handling
Apple has emphasized that privacy remains a core component of GymKit. When using the iPhone and AirPods combination, all health data is encrypted and stored locally on the device. The gym equipment receives only the information necessary for the workout – primarily heart rate – and does not retain any personal identifiers after the session ends. Users can review and delete workout data at any time through the Health app. The permissions for AirPods heart-rate sharing are also granular, allowing the user to disable it entirely or only enable it during specific activities. This level of control aligns with Apple's stated commitment to user privacy.
In testing, a sample 16-minute treadmill walk recorded 0.66 miles, 65 active calories, 97 total calories, 32 feet of elevation gain, and an average heart rate of 115 BPM. These figures were identical to what would have been recorded if the user had worn an Apple Watch. The consistency of the data demonstrates that the new system is reliable for everyday use, making it a viable alternative for those times when the watch is unavailable.
Overall, the introduction of GymKit on iPhone and AirPods Pro 3 is a small but significant update that solves a real-world problem. It leverages existing hardware in a new way and fills a gap in Apple's fitness lineup without cannibalizing the core Apple Watch experience. Instead, it enhances the overall ecosystem by providing continuity and flexibility for users who rely on multiple Apple devices throughout their day.
Source:9to5Mac News