Comparing Swiss ball exercises, Marshall et al. (2010) assessed rectus abdominis muscle activity during the plank with arms on the Swiss ball, single - leg hip
hyperextension from the push up position with legs on the Swiss ball, single - leg squat against a wall on a Swiss ball, Swiss ball roll outs, and Swiss ball full body rolls from a supine bent leg start position with the upper back on the ball, and rotating 90
degrees until the shoulder and upper arm rests on the ball.