Shoulder motion exercise device and method of use

A shoulder motion exercise device for use with an extender having an axial length, the shoulder motion exercise device comprising:

• a hand-grippable slider coupled to a proximal end of an elastic resistance connector, a distal end of the elastic resistance connector coupled to a retainer, the retainer configured to be releasably securable to or adjacent to an elbow of a non-dominant arm of a human user, wherein:
• the elastic resistance connector has an unstretched connector length of at least 6 inches and the unstretched connector length increases by at least 2 inches when subjected to an axial tensile load of 5 lbs;
• the slider comprises a tubular body having a slider length of at least 3.5 inches, and the slider is configured to receive the extender through the tubular body thereof and to be gripped by a dominant hand of the human user and slid along the axial length of the extender;
• and
• the retainer comprises a band having a width, a length, a first end, and a second end, wherein the first end and second end are releasably joinable at a retainer release point to form a continuous band;
• wherein, in the course of a swing of the extender, the slider moves from a first position along the extender axial length of the extender to a second position.