Squats are a great exercise for sculpting your whole body, and the extra chop and swing motion in this move means your abs will be working overtime. Plus, the powerful pace puts your heart rate in the cardio zone (zapping fat faster)!
How to do it: Stand tall with your feet hip-width apart, holding the ends of one dumbbell. As you push your hips back and lower into a squat, bend your arms and "chop" the dumbbell across your body to the outside of your left hip. As you press back up to standing, extend your arms and swing the dumbbell over to the right side of your body, turning your torso to the right (the dumbbell should stay at chest level as you twist), pivoting your left heel off the floor, and rotating your left hip to power the swing. Quickly return to your squat and repeat the chop.
Form tip: Brace your abs in tight as you perform the swing. It should feel as though your abs are catching the dumbbell at the top of the movement.
60-second cardio burst: When you've finished 15 reps/side, do as many jumping jacks as you can in a row until 1 minute is up.