Exercise Like a Kid

The more you enjoy exercising, the more likely you'll stick with it, says personal trainer Debi Pillarella, of the American Council on Exercise. Kids play these games just for fun, but you can get a healthier heart and slimmer body:

Jump Rope: Even without the "A, My Name is Allison" song, you'll tone your calves and build agility, strength and endurance. Just 15 minutes of vigorous jumping burns almost as many calories as a half-hour jog.

Hula Hoop: This targets your abs and obliques for that sculpted-waist look. For a tougher workout, try a weighted version.

Scooter: The standing legs gets stronger, while the pushing leg gets an endurance workout. "It's a great cardio and will firm up the legs," says Phillarella. Balancing works the core, trimming abs.

Trampoline: Not recommended for children, but a high-intensity session on a mini-tramp burns about the same number of calories as running, without knee-jarring impact - just be sure you don't fall off.