Welcome to X-Over Shoulder and Arm Resistance Bands! These bands are made specifically to build the upper torso. With Extreme exercise at home, in gyms or in a Box gym, there is a real risk of injury to the shoulder joint. X-Over bands are designed to work the smaller muscles such as the Rotator Cuff and the larger muscles such as the Trapezius , BUT also works the hard to build smaller supporting muscles around them. This particular cord's crossing motion will not only assist in defining the smaller muscles, but will provide you with more support so you can dead lift more, bench press more and all around give you a stronger base where you can take your extreme workout to the next level without injury.