With the free swinging motion of a gymnastics ring and the peg holes of a peg board the Chain links offer you gains in wrist and arm strength as well as core. Their free swinging motion also forces your core to compensate for not having a wall to stabilize you. Bring old exercises to a different degree. Pull ups just bumped up a level. Not only do these force you to use your core but they also change the position of your wrist and grip. Strengthening muscles you just cant get to with a standard pull up. On top of that they can be used for any number of other things. Need to practice grip on chains? No problem. Easily adjusted to different heights with just the click of the carabiner.