My Cat Needs a Workout

Aa you watch the final second or so of the above video, you should notice my cat Hershey's little pouch swing like a pendulum on a grandfather clock in overdrive as he scampers out of my room. Personally, I've never seen any reason that cats can't get an indoor workout. Even though he's eight, he does still have the playfulness of a 8 month old kitten. Still, I wonder if he needs something more. Something like this: