Many sports are played in water.
The following is a list of water sports, divided by category. This list is not complete. Some of the sports include only one part to swimming, as for example Triathlon.
Apnea - The practice of not breathing for extended times.
Underwater rugby - Rugby played under water with a ball that has been rendered neutrally buoyant. Surfacing to breathe is only allowed without the ball.
Underwater hockey - Hockey played under water with short wooden curved sticks and a heavy puck. Players wear diving masks, snorkels, and fins, and must surface to breathe while team mates continue the game on the pool bottom.