SQUAT JUMPS
Starting Position: Begin in a standing position with legs hip distance apart, arms relaxed. Bend from your kness lowering your height. Keep your knees over your ankles, lowering your hips behind your body. Image you have a chair behind your glutes and you stop right before sitting in the "imaginary" chair. From this low sitting position, spring or jump into the air using your quads and glutes extending your legs into a straight position. Engage through out the entire exercise with your abdominals, maintaining a neutral position in your back. Land softly on the balls of your feet returning the entire foot to the floor.
Inhale as you lower into the low squat position, and exhale as you jump into the air. Repeat 15-30 times Rest, then repeat 15-20 times.
START: 
FINISH:
Avoid: Planting your legs too wide during the squat or allowing the knees to extend out in front of your toes.