Tuck Jumps

Place your feet at shoulder-width with your toes pointed slightly out. Brace your core and keep your chest up. Bend first at the knees then at the hips. Lower yourself slightly to pre-engage the hamstring muscles. Now launch yourself up into the air. At the same time, bring your knees up towards your chest in midair. Land on both feet with slightly bent knees. Move right into your next jump.