Three movements on the bosu ball will challenge your balance and stability. They will also build strength in your lower body. First, warm up. Then, do a simple back squat on the bosu ball. Stand on the bosu ball with our feet in front of you, extend your arms, and squat. Do eight to ten repetitions. Then, do a one legged squat. Place one foot in the middle of the ball and extend the other leg back. Squat down and up. Do ten to twelve repetitions. The final exercise is a lateral one legged squat. Place one leg in the middle of the ball and extend the other leg down and out to the side. Squat down and up. Throw in barbells for resistance.