... with 12 grip positions makes this the perfect tool for chin-ups and pull-ups. Place this exerciser ... frame, allowing you to placed your feet underneath for sit-ups, crunches and other abdominal exercises.Door ... s the ultimate body sculpting and strength building tool that helps shape the upper body and tones ... into a personal gym; installs in seconds ideal for pull-ups, chin-ups, dips, crunches, and ...