Set-up: Position a stability ball by your feet and lie down on your back on a mat. Bend your upper legs to 90 degrees from your lower back and place your heel on the stability ball. Raise the other leg up so it cannot be used for support.
Lift: Lift your hips off the floor so that a straight line forms between your shoulders, hips and heel. Hold at the top movement.
Repetitions: Perform all prescribed reps on one side, then on the other. This counts as one set.
Muscle Roles in stability ball single leg hip thrust