US Patent 7322909 Doorway-mounted exercise device with resistance bands

A portable exercise device includes a main tube having an adjustable length. The main tube includes a central tube and an outboard tube connected to opposite ends of the central tube. First and second door jamb gripping devices adapted to engage a door stop of a door jamb are secured to respective outermost ends of the outboard tubes. A handle is secured to each outboard tube and a pulley is mounted within a hollow interior of each outboard tube. A first resistance band has a first end engaged to a third handle, a second end engaged to a fourth handle, and a medial part positioned in a hollow interior of the main tube that engages the first and second pulleys.