System to improve swinging motion

A shirt for improving a swinging motion of a user wearing the shirt, the shirt comprising:

• front and rear panels each having corresponding top, bottom and generally opposing side edges, wherein the front and rear panels are adjoined to each other by the top and side edges, defining an interior space of the shirt;
• said front and rear panels including sleeve cutouts formed on each side edge adjacent the top edge, and a neck cutout formed on the top edges of the front and rear panels;
• at least one tubular sleeve permanently joined to the front and rear panels of at least one of the sleeve cutouts, the tubular sleeve defining an inside area, the inside area being fluidly connected to the interior space of the shirt;
• a member substantially adjacent to the sleeve cutout and the side edges of both the front and rear panels, wherein the member is removably attached or permanently attached to the shirt;
• the member further comprising a processor, a network access device and at least one sensor, wherein the processor is in communication with the network access device and the at least one sensor, the processor being configured to determine at least on characteristic of the swinging motion of the user based on information received from the at least one sensor;
• and
• the member having a body portion with a curvature, the body portion having a side that is substantially flat along the curvature that follows a length of the member and a second side that is substantially semicircular.