Karate, unarmed martial-arts discipline employing kicking, striking, and defensive blocking with arms and legs. Emphasis is on concentrating as much of the bodies power as possible at the point and instant of impact. Striking surfaces include the hands, ball of the foot, heel, forearm, knee, and elbow. All are toughened by practice blows against padded surfaces or wood. Pine boards up to several inches in thickness can be broken by the bare hand or foot of an expert. Timing, tactics, and spirit, however, are each considered at least as important as physical toughening. In sporting karate and sparring in training, blows and kicks are stopped short, preferably within an inch of contact. Sporting matches commonly last about three minutes, to a decision, if neither contestant has scored a clean killing point in the estimation of the judges.