Despite playing in the league for close to a decade, Mackey Sasser's MLB career is defined by one word, "Yips." Via interviews with Mackey and his sports psychologists, and a look at his treatment, this film examines the mental side of sports. (15:28)

NEW YORK -- Despite playing in the league for close to a decade, Mackey Sasser's Mets career is defined by one word, "Yips." Via interviews with Sasser and his sports psychologists, and a look at his treatment, this film examines the mental side of sports.