Starting in the forearm plank position. Your body should be in a straight line from your head to your heels.
Engage your abs to help keep the spine stable. Jump both feet out wide to each side as if you were doing a jumping jack. Stay in plank position as you quickly jump your feet back together. Continue to jump back in and out only with the legs. Keep your back flat and don’t let your hips drop which keeps a neutral spine throughout the entire movement.