A With feet slightly wider than hip width, lower into a squat position with arms extended in front of chest. Place left palm on top of right.
B Lower arms down by hips in preparation to quickly stand up, reaching arms overhead and lifting heels off the floor. Immediately return to start position and repeat as quickly as possible for 45 seconds. Tip: This move should feel like a squat jump without leaving the floor. Make your movement quick and explosive, but instead of jumping up just lift the heels off the floor.