Powercore Gym Rings (Plastic)Rings have a great deal of mobility. As the lifter presses against the rings, they will often vibrate or move and stabilizing this movement creates a higher degree of muscle recruitment. The gym rings are affordable, portable and it easy to set up in a gym or at home. The versatility of the gym rings is what makes them a must have! You can use them for a variety of exercises, unlike many gym machines that serve only one function. Gym rings are fast