Want an exercise regimen with ironclad results? Pick up this cannonball-like weight. The handle lets you swing it, so you can rev up your heart rate while challenging multiple muscle groups. Research shows that using a kettlebell can burn 40 to 50 percent more calories (!) than a typical strength-training session. Get into the swing of things with an 8- to 15-pound bell (from $33, power-systems.com), a stopwatch, and these moves from Los Angeles–based trainer Paul Katami, the creator of the DVD Ultimate Kettlebell Workouts for Beginners ($17, amazon.com). Do the routine twice, three times a week.
New to kettlebells? Learn how to maintain good form and avoid injury by following these easy tips for a great kettlebell workout.