Notice they all need encouragement from a laser pen or toy to play on it. Cats are far too sensible really, left to their on devices they'd just use it to lounge about on all day.

That probably depends on the cat. The comments say that someone had Bengal cats that would use one unprompted.

once they are in, close off the side and connect to a motor.

Cool. I'd get something like that for my Yoshi cat if I thought there was a chance he'd use it. Interesting Kickstarter campaign that got 340% of the goal: https://www.kickstarter.com/projects/620439316/one-fast-cat-exercise-wheel

That music..............

There was an exercise wheel for humans on Skylab, too. But it worked a little differently in a microgravity environment.
https://www.youtube.com/watch?v=S_p7LiyOUx0&t=23

*happy, *music

Adding video to channels (Happy, Music) - requested by Zawash.