hands free to do work if necessary. This method of treading of water is the preferred method used by lifeguards and other aquatic rescue professionals because of its efficiency and simplicity. The fact that it does not occupy the hands is a major factor in this preference as these professionals often have to perform first aid as they are swimming to safety. Eggbeater is used in water polo because it lets the athletes use their arms to throw the ball. The eggbeater kick is the primary kick that enables the player to support themselves in the water while passing, shooting, defending, and resting – horizontally and vertically. It is also used for getting a quick, explosive start, when the player is beginning to swim. Greater elevation of the Polo player is created by a stronger eggbeater kick which results in a better rotation and stronger pass or shot. Overuse of the eggbeater kick has been a cause of knee injuries in water polo players. Eggbeater is also used in synchronized swimming for stability and height above the water while leaving the hands free to perform strokes. Using the eggbeater, swimmers can also perform "boosts", where they use their legs to momentarily propel themselves out of the water to their hips or higher. The dog paddle is a simple style often used instinctively by children. It involves waving both hands & legs randomly while "on all fours". Another popular style involves sculling water horizontally while using flutter kicks vertically. See also List of swimming styles Spyhopping, vertically and momentarily staying out of the water by whales References Swimming styles