For a ball lunges (rear foot on stability ball) -- Stand tall in front of a stability ball; pull your right leg back and place your foot on the ball. Now press into a lunges pose; with your knees bent and your rear foot rotating the ball back. Do so at least 5 to 8 times on one leg and then change leg. Completing this step one both legs will give you a ball lunges (rear foot on stability ball).
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