Build your upper body, get well defined abs, and achieve stronger arms and back with the XMark Fitness Power Tower w/Dip Stand and Pull-Up Chin-up Bar Rubber Grip Handles. A Power Tower, also known as a knee raise station and captains chair, is known for building upper body, abdominal, arm, and back strength. This Power Tower has ergonomically spaced dip handles with rubber grips and hand grips for vertical knee raise. The XMark Fitness Power Tower w/Dip Stand and Pull-Up Chin-up Bar has a comfortable 2.5in Hi-density cushion with tear resistant Duraguard vinyl. Its skid resistant feet help protect floors against damage; and scratch resistant finish and 14-gauge steel construction for a more durable Power Tower that can last you a Manufacturers Lifetime.