The bosu ball squat is a simple yet effective exercise that can help to strengthen and tone the legs and butt. To do this exercise, start by placing the bosu ball on the ground in front of you. Next, stand with your feet hip-width apart and place your hands on your hips. Slowly lower your into a squatting position, making sure to keep your knees behind your toes. Hold for a count of two, then return to the starting position. Repeat for 10-12 repetitions. For an added challenge, try doing this exercise with one legraised off the ground.