Squat to Knee-Up Stand with your feet shoulder-width apart, feet parallel. Place your hands behind your head. Bend your knees and lower your hips until your thighs are parallel with the floor, keeping your weight back in your heels. As you return to standing, twist your torso and lift your left knee to meet your right elbow. Immediately go back into a squat, and repeat the exercise, this time bringing your left elbow and right knee together at the top of the move. Continue this squat and knee-up sequence for 40 seconds. Image Source: POPSUGAR Photography