Some newer fitness machines offer the ability to connect to your Apple Watch to automatically sync data. If this pairing is not done automatically, you can disable the detection of fitness equipment on your iPhone. That's how it's done.
Open the app "Watch" on your iPhone.
From the main menu, tap the "Workout" option, which is half way up the list.
Scroll down to the bottom of the list and turn off "Detect Gym Equipment".
If you ever want to reset the setting, you can jump back to the "Training" menu and re-enable "Detect gym equipment".
And that was it's. Your Apple Watch does not recognize and connect automatically to GymKit-compatible fitness equipment.
If you still want to sync smart fitness device data to your Apple Watch, you can also disable the auto-detect feature. All you have to do is open the workout app on your watch and then keep it close to the device.