Punch Off the Pounds
For quads and abs
Stand with feet shoulder-width apart and knees slightly bent. Bring fists to cheekbone level, with elbows in toward chest. Raise right knee to hip height, flex your foot, then quickly kick your foot straight out. Return to starting position, and repeat with left leg to complete 1 rep. Do as many reps as you can in 20 seconds, rest for 10 seconds; repeat 3–5 times.
Trainer tip: To add more of a challenge, raise knee to chest before kicking; to make it easier, kick lower and slower.