Each move in this circuit by Keli Roberts -- who's trained stars from Kirstie Alley to Cher -- tones several trouble spots at once. To do: Warm up with 5 minutes of light cardio: jump, march, whatever pumps your blood. Tackle the first three exercises consecutively and follow it up with 1 to 3 minutes of cardio. If you need to rest before the next three, walk in place for 30 seconds. Work toward completing the entire circuit (all nine moves with three cardio intervals) without resting. Do this three times a week, and you will feel more confident, and appear leaner, in just 21 days. Repeat entire circuit two times and use 8 to 10 pound weights (if comfortable) for quicker results.
Three-Way Squat Targets: Thighs, butt, core
Stand tall (chest lifted, abs tight, back straight) with your feet shoulder-width apart and a 3 to 5 pound dumbbell in both hands in front of you. Bend your knees and sit your hips back while reaching the dumbbell to the floor. Press into your heels as you straighten your legs, bring the dumbbell off the ground and return to starting position. Repeat -- but this time, as you squat, twist to the right and lower the dumbbell to the outside of your right foot. Return to starting position. Repeat squat on the left. Alternate between center, right and left, for 45 seconds, then immediately move on to the next exercise.