Almost all my cats and kittens love the wheel.

If the kitten has already learned to run in a wheel from me, then you can probably buy any. If not, then I recommend this wheel: 

Cat Exercise Wheel With Carpeted Runway

I like it for several reasons: it’s compact, it arrives already assembled, it’s quiet, and cats can’t hurt themselves in it. They usually sell wheels and there’s a gap where someone will definitely stick their paw in once. And then they’ll be afraid of that wheel for a year.