Chin-ups are, without a doubt, the best upper-body resistance exercise. There is no other exercise that can adequately replace its functional value. Not only do chins work the back and biceps, but they also work the abdominals, chest, and grip. In a gym, a chin-up bar is also a very useful fixture because it can be used as an anchor for rings, bands, or a TRX. There is no play or movement in the Wall Mounted Multi-Grip Chin Up Bar because it is bolted flush to the support brackets.