straight leg supine bridge - single leg, on stability ball
Set-up: Position a stability ball by your feet and place your upper back on a mat.
Lift: Place the heel of the active leg on the stability ball. Lift the opposite leg above the working leg by 6-12 inches. From this position, lift your hips off the mat, forming a straight line between your shoulders, hips and feet. Brace through the glutes and the core to maintain stability. Hold the position for the prescribed time, then switch legs.
Repetitions: Once both legs have been raised and held, this counts as one repetition.
Muscle Roles in straight leg supine bridge - single leg, on stability ball