A great active warm-up movement to improve hip mobility. Sit on your but with your knees bent and feet flat on the floor. Spread your feet and knees a little wider than hip-width. Brace your upper body with your arms keeping your head and shoulder in good posture. Rotate both knees toward the floor and hold for two seconds and then rotate to the other side. Keep rotating your knees and hips from side to side for the prescribed number of reps.