US Patent 7503883 Resistance exercise device

A resistance exercise device comprising at least one handle and a cord having a pair of ends and a length extending between the pair of ends, the handle being secured to one of the ends of the cord, the cord being stretchable to extend the length and comprising a plurality of tubes extending substantially the entire length of the cord, the tubes being conjoined together along substantially the entire length of the cord by means of braiding. The tubes are conjoined together such that the tubes are snug along substantially the entire length of the cord and such that each of the tubes is in contact with at least one of the other tubes substantially along the entire length of the cord. The resistance exercise device may further comprise a plug and sleeve for securing the handle to the end of the cord.