HOW: Place a bosu ball with the ball side up a few feet in front of you on the ground. Step straight forward with one leg onto the top of the bosu ball. Bend your knee when your foot is on the top of the ball while keeping your back upright. Slightly bend the knee that is back to create a lunge onto the ball. Then push yourself back and to the starting position. Repeat.
FEEL: You should feel your quadriceps and glute muscles working the most.
COMPENSATION: Don’t bend your back as you lunge forward, stay straight up. Keep the front knee bent over the toes, not out to the side.