Keep your core braced and back flat as you bend slightly forward. Perform a small jump to the right. As you do, bring your left leg behind you and tap the ground. At the same time, bring your left arm in front of you and touch the ground with your hand. Now, jump to the left, bringing your right leg behind you to tap the ground and your right arm in front of you. Repeat the movement, alternating back and forth for the required number of reps (or time).