Most active cats will hop right onto an exercise wheel, but not all cats have that bravery. If you need to train your cat to get on a moving wheel, it can be difficult, but not impossible. The easiest thing to do is entice them to try it using catnip. Sprinkle some on the cat running wheel and see if they at least get in there. After that, it's all about giving them space and time. Your cat may not seem interested in the moment to start running on their new exercise wheel, but at 2am they may have a different opinion entirely.