20-Minute Toning Workout

Gain core strength and trim your arms, abs, and legs in this all-over toning routine that only takes 20 minutes.

Make this the month you trim your tummy, strengthen your core, and gain confidence in your appearance.

The plan: Complete these strength exercises two or three times a week (they'll take about 20 minutes). Warm up first with some moderate-paced cardio (walking in place, for instance) for five minutes. Do the number of repetitions specified for each given workout.

The strategy: Combining exercises back to back is one of the best ways to maximize your time. "Because you're constantly moving, you keep your heart rate elevated and burn more calories," explains New York City trainer Lacey Stone, who masterminded our routine. As the month progresses, increase the number of times you do each exercise and the number of reps while decreasing the amount of rest time.

What you'll need: A set of 3- to 5-pound (beginners) or 8- to 15-pound (advanced) dumbbells, a mat, and a sturdy chair.