The gym machine reads your heart rate data and estimated calorie info, while the watch gets extra information from the gym machine, like stairs climbed or elevation.
GymKit is launching in one fitness center in New York to start, but Life Time Athletic and Equinox centers will start using GymKit-ready machines in North America in 2018, along with Fitness First in Australia.
Right now, GymKit is only being used on professional fitness machines in fitness centers. It's possible it might be used on home equipment in the future.
Discuss: The future of Apple Watch fitness might be GymKit
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Discuss: The future of Apple Watch fitness might be GymKit
Be respectful, keep it civil and stay on topic. We delete comments that violate our policy, which we encourage you to read. Discussion threads can be closed at any time at our discretion.