Our exclusive Aqua Rolling Massage™ pushes water up the back  of the seat through specially designed recesses in the spa shell.  The resulting agitation of the water creates a vigorous massage that works the muscles throughout your back. Only Glacier Executive Swim Spas offers a therapy system for your lower back muscles that allows you to isolate specific areas with the intensity of massage you desire. You have the benefit of a fully customized massage spa and the ability to swim and train all year round in one unit.