This exercise works the thigh muscles.
Stand upright with the Pilates ball between your ankles. Slowly lift your heels and balance on your toes.
Lift your arms up overhead and engage your core.
Inhale and bend your knees, but try not to let your heels touch the floor. Exhale and straighten your legs, returning to the start position. Repeat 8-12 times, rest, then repeat the exercise if desired.