Strengthen your core, hips, quads and back using this abs exercise to build full-body strength, endurance and stamina.
The hollow hold is an isometric exercise, which means your muscles contract without lengthening or shortening — in other words, you won’t move. To do it, extend your arms behind you, lift your upper back and legs away from the ground, point your toes and create a soft C-shape with your body. Contracting as many muscles as possible, hold the position.
