The portable exercise device includes a housing, a rotating spool, a plurality of cables, a plurality of handles, at least one securing strap, and a tensioning knob. The device is temporarily installed about the front surface of the seat back via a single or plurality of straps. The tensioning knob provides varying levels of resistance with the rotating spool. The rotating spool has a spiral coil spring that places a rotational biasing force upon the spool such that the cables will wind upon the rotating spool.