The JUNGLE GYM is the perfect workout partner. The JUNGLE GYM's chin-ups challenge users more than traditional fixed wall chin-up brackets because of its unstable nature, forcing the user to constantly adapt and stabilize. You can hook it up anywhere, from a door to a tree limb to an overhanging pole or beam. It can fit into your pocket or backpack (weighs about one pound) and can change lengths in seconds so as to give the user options of how to use it. Comes complete with instructions by fitness expert Jon Hinds, CSCS, CPT, NASM, former strength coach of the LA Clippers.