Shoulder motion exercise device and method of use

A shoulder motion exercise kit, comprising:

• a hand-grippable slider (400), slidably engaged to an extender (300) having an extender axial length (305), a proximal end (310), an extender gripping portion (330) applied to the extender (300) for grasping by a non-dominant hand of a user (U) and having a grip portion length (332) of 3.5″-8″ and sized and configured with the slider (400) to simulate a conventional golf grip, a distal end (320), and an extender slidable portion (340) having a slidable portion length (342), a proximal slider position (360), wherein a portion of the slider (400) is within 8 inches of the proximal end (310), and a distal slider position (370) along the slidable portion length (342), wherein the hand-grippable slider (400) is releasably coupled to a proximal end (210) of an elastic resistance connector (200) and releasably coupled at a distal end (220) of the elastic resistance connector (200) to a retainer (100) configured to be releasably securable to a non-dominant arm of the user (U), wherein the elastic resistance connector (200) has an unstretched connector length and an ultimate tensile strength of at least 50 lbf, wherein the slider (400) is a hollow structure with a slider length of 3.5″-8″, an exterior surface, and an interior surface, and wherein the interior surface of the slider (400) encircles a portion of the extender (300) and is only removable from the extender (300) at the proximal end (310) or the distal end (320), the exterior surface of the slider (400) is configured to be held by at least three fingers and gripped across a portion of a palm of a dominant hand of the user (U), and the combined mass of the extender gripping portion (330) and the slider (400) is 25-100 grams;
• the elastic resistance connector (200) has a first functional length, in a first functional position with the user (U), with the slider (400) positioned at the proximal slider position (360) of the extender slidable portion (340) and the retainer (100) secured to the non-dominant arm of the user (U);
• the elastic resistance connector (200) has a second functional length, in a second functional position with the user (U), greater than the first functional length, with the slider (400) positioned at the distal slider position (370) of the extender slidable portion (340) with the dominant hand spaced apart from the non-dominant hand after the slider (400) has moved throughout at least 12 inches of the slidable portion length (342), and the retainer (100) secured to the non-dominant arm of the user (U);
• the elastic resistance connector (200) has a plurality of functional lengths with the slider (400) positioned at a plurality of positions between the proximal slider position (360) and the distal slider position (370) along the axial length of the extender (300) and the retainer (100) secured to the non-dominant arm of the user (U);
• the unstretched connector length is 6-22 inches;
• the elastic resistance connector (200) comprising at least two user interchangeable connectors including at least a first elastic resistance connector and a second elastic resistance connector, wherein the first elastic resistance connector and the second elastic resistance connector have different elastic properties;
• and
• a weight is attached to the extender (300) and retains the slider (400) on the extender (300).