Step 1: Start out in the same position as when doing a regular lateral jump.
Step 2: Jump to the left like you would do in a regular lateral jump, but this time, land on your left foot, keeping your right foot just off the ground.
Step 3: Now, jump to the right, pushing off your left leg. This time you will land on your right foot and keep your left foot in the air.
Continue jumping left, right, left, etc. The key to remember is to land on your outside foot and keep your inside foot in the air.