Double Duty: Strength-Training Moves That Get Your Heart Rate Soaring

Don't let this move fool you — side skaters work the butt, hamstrings, thighs, and core. It also challenges your balance and agility and builds ankle strength. Pick up the pace on these, and in no time at all, you are sure to be out of breath!

• Start in a small squat. Jump sideways to the right, landing on your right leg. Bring your left leg behind to your right ankle, and don't let it touch the floor.
• Reverse direction by jumping to the left with your left leg. This completes one rep.

If you find that you have a hard time balancing in this move, allow your back foot to touch the ground (as seen here), but challenge yourself by picking up the pace.