Here is a review of the TRX system. The system is basically just two straps that hang from the door, which allows you to work out any body part that you wish to: chest, back, legs, biceps, and everything else. The different exercises that you can do on this thing is amazing. It’s an incredible system. The US Army and Marines use this syste and it’s also used by NFL players such as Drew Brees, LaDainian Tomlinson, and Reggie Bush.