Stand with your back against a wall and place an exercise ball between your lower back and the wall. Position your feet shoulder-width apart, with your toes pointing forward. Hold a dumbbell in each hand, with your arms extended by your sides. Raise your heels off the ground, lifting your body weight onto the balls of your feet. Pause for a moment at the top, then slowly lower your heels back down to the starting position. Repeat for the desired number of repetitions.
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