Yes, wheels are recommended to help them spend their energy, exercise, cardio-vascular, etc.
A friend of mine had problems with the noise, from constant use of the wheel it eventially started squeaking, ...so as a solution to the problem, he'd built a custom running wheel, it was really neat. He used some of the original wire wheel parts, then customized it. So now, the wheel utilizes ball bearings instead of the static method. and instead of using regular grease, he uses Crisco cooking lard. Works like a charm!! He's one of those self sufficient kind of people, ...how does he come up with ideas for the things that he builds? I'll never know. (lol!)
Just thought I'd share that, figured maybe it will help you out somehow.