Rock Exotica FatGrips Pull-Up GripsFatGrips use a large diameter (2") rotating grip that forces your grip and forearms to work much harder than they do with a conventional pull up bar. The swivel allows you to orient them as you like for pull ups, chin ups or anything in between. The swivel action increases the difficulty because you have to hold them in the orientation that you want, recruiting stabilizer muscles. And unlike rigid bars, the swivel action doesnt cause harmful torque on