Watch Power Workout with Dumbbells - Tone, Strengthen & Lean Out Your Entire Body

These 15 moves will tone and strengthen your arms, abs, back, butt, core, legs and shoulders in a short amount of time. This workout burns 251 - 344 calories. By hitting multiple muscle groups at the same time, this workout scores you a total-body workout in 30 minutes flat. Plus, since it doesn't dwell on any single muscle for very long, it lets you train harder. All you need is a pair of dumbbells, try five to ten pounds. Trust us, you'll feel sore the next day.