Stand in a staggered stance with your feet 2 to 3 feet apart, your right foot in front of your left. Keeping your torso upright, bend your legs and lower your body into a lunge. Now jump with enough force to propel both feet off the floor. While you’re in the air, scissor-kick your legs so that you land with your left leg forward.
Repeat, alternating your forward leg for the duration of the set. Every two times you land equals a rep; do 10 reps.
Note: If you are very out of shape, overweight, or have knee problems, avoid this exercise. Do a high-knee march in place instead.