Step 1: Start by standing with your feet approximately shoulder-width apart with your elbows straight and your hands by your sides and slightly behind you.
Step 2: Imagine there is an invisible line between your feet. Using your entire body, jump with both feet at the same time, about a foot from each side of the imaginary line, while simultaneously using your arms to provide added momentum. Be sure to land firmly on both feet.
Step 3: Jump side-to-side for two minutes per set and try to do three sets.

While this exercise may seem hard at first, try to stay with it and simply do what you can to build up over time.