Yes, this actually exists. And cats are crazy for it.
Many of us struggle to provide ample exercise for our indoor cats, but perhaps no longer. Catswall has answered the cat owner’s prayer by making a cat exercise wheel! This is just what it sounds like—a big hamster wheel for your cat to run on. If you have an energetic cat or one who needs a little more of a work out, the CatWheel will give your cat the activity he craves. Use it in conjunction with a laser pointer for extra fun/motivation! $699, catswall.com