Shoulder pain (Hawkins & Hobeika, 1983; Lo et al., 1990) and impingement of the rotator cuff caused by anterior instability of the shoulder joint (Hawkins & Kennedy, 1980; Pieper et al., 1993; Ticker et al., 1995) are frequent problems for athletes engaged in overhead motion. Painful shoulder conditions have been studied in tennis, baseball and swimming (DeBenedette, 1989; McCann & Bigliani, 1994; Pink & Tibone, 2000; Weldon & Richardson, 2001). Badminton is a sport that requires a lot of overshoulder motion, with the shoulder in abduction/ external rotation.