I don't want to overwork my pal too much (he can be pretty sprightly, but lacks stamina), but for the sake of his health I've been advised to make him exercise more. I've tried the usual toss-a-ball-of-wadded-paper stuff, but was wondering if anyone has tips for giving him some lighter, more sustained exercise. I've even thought of buying a cat harness to walk him around- but my neighborhood isn't the best place to do it.