The key to really good-looking arms is to make sure that all the muscles in the arm are trained. The arm consists of two muscles, the biceps and the triceps. With this gear you train both of these muscles, as well as the back muscles and chest muscles. Get rid of excess skin or fat on the arms and let the muscles be visible. You’ll get a nicer posture and a nicer body at the same time using this exerciser on a regular basis.