... 12 grip positions makes this the perfect tool for chin-ups and pull-ups. Place this exerciser bar on the ground and it ... other abdominal exercises.Door gym chin up barYou can do pull ups and chin up, sit up, and dips. In addition, with ... doorway into a personal gym; installs in seconds ideal for pull-ups, chin-ups, dips, crunches, and more three grip positions, narrow, wide ...