Because the demands on the goalie are mostly mental, it means that for a goalie the biggest enemy is himself. Not a puck, not a opponent, not a quirk of size or style. The stress and anxiety he feels when he plays, the fear of failing, the fear of being embarrassed, the fear of being physically hurt, all symptoms of his position, in constant ebb and flow, but never disappearing. The successful goalie understands these neuroses, accept them, and put them under control. The unsuccessful goalie is distracted by them, his mind in knots. His body quickly follows.