[enaaem]

They would probably make something like FitnessKit similar to HomeKit, so that your iPhone can adjust settings on your fitness device. Fitness device makers can then make apps to give you exercise programs and track your progress. It might already exist. I don't know.

[klelatti]

A bike that you can attach your iPad to seems like one way too. They probably don’t want to make iBikeOS for a new class of iDevices!

Seems to me that management bandwidth is probably the main issue given Apple’s structure.