The Fitness Circle Pro is a must-have for all Pilates instructors. Used on the Mat, the Reformer, or other equipment, this portable piece helps maintain proper alignment and increase proprioceptive awareness. The Fitness Circle Pro is made of spring steel and built to withstand continuous, high-intensity studio use. Add resistance for upper and lower-body exercisesthe Fitness Circle Pro improves muscle tone and is great for problem areas that are hard to firm up: inner and outer thighs, upper arms and chest.