US Patent 7578775 Personal exercise system

An exercise system includes an elastic cord assembly including an elastic and plugs. The elastic has a first and second end and a stretch between the first and second ends. One of the plugs is inserted into the first end and another one of the plugs is inserted into the second end. At least one strap assembly is slidably attached to the elastic cord assembly. The strap assembly includes a block having an aperture formed from one side to another side of the block forming an unbroken wall through the block. The strap assembly also includes a strap connected to the block in a manner that forms a loop in the strap. The plugs retain the strap assembly on the stretch of the elastic cord assembly between the first and second ends.