Apple only mentions 2 Schwinn bikes as compatible with Fitness+. Can you use other bikes?
What level of integration do the bikes give you during fitness+ workouts? Are there plans to include other bikes?
Apple Watch
You can use any equipment you want but your results of how far you went or calories burned may not be the same on your Fitness+ workout compared to what the equipment says. The equipment that is compatible simply connect to the Apple Watch and give the most accurate information. For example I frequently walk on a treadmill and while the treadmill says I went 2.5 miles, my watch may say I went 2.55 miles.