Sports are competitions that are mostly in the sphere of physical activities, but there are also sports that are not related to physical activity, such as chess. Sport is not only a physical activity, but also involves a mental aspect, including motivation, persistence, tactics and strategy. Sport is important not only for its health benefits, but also for the social and psychological benefits it brings, such as improving self-confidence, developing friendships and building team spirit. It is usually a contest or game between two parties, each trying to outdo the other. Some sports allow a draw; others provide methods for resolving ties, to ensure one winner and one loser. A number of such two-way contests may be arranged in a tournament, producing a champion.