Method and hands-free apparatus for muscle isolation during weight lifting exercise

An exercise apparatus comprising two adjustable cuffs configured to encircle a user's extremity on either side of an articulated joint, such as the elbow. Each cuff is provided with a connector ring for conveniently connecting a pull line to a weight machine, suspended free weight, or other resistance generating exercise machine. One or both connector rings may be engaged by the pull line. The two connector rings are interconnected by an adjustable-length isolator strap which limits the range of motion of the user's elbow. By isolating arm movement, the apparatus enables isolated exercise of chest, shoulder, or back muscle groups. As hands are not necessary, the apparatus also enables users having a hand or other lower arm infirmity to continue other upper-body muscle exercises.