Surfing is an extreme sport powered by waves. The surfer lies prone or sits on the surfboard and waits in the sea where there are suitable waves. Paddle in the direction of the waves, and give the surfboard enough speed to keep the surfboard in front of the waves. When the waves push the surfboard to slide, the surfer stands up, stands naturally with his legs back and forth, bends his knees slightly, and uses the center of gravity of the body , shoulders and back legs control the direction of the surfboard.