The Miami Herald has an article highlighting some gadgets that make exercise more fun. Among them are the Vurtego Pro Pogo Stick. (On Amazon.com, the Flybar 800 Pogo Stick got better reviews and it's cheaper.)

Exercise can be all fun and games and still be very effective. Want an anaerobic workout? Play catch. Want to stretch some muscles? Throw a Frisbee. Need to get some endurance work in? Go to the beach and swim.

Yes, treadmills are very effective, but they are not the only way to get your workout in.