The main principle of swimming is floating or buoyancy. In sports, speed is off essence. The swimming competitors will be required to swim and cover a certain distance within ascertain duration. It is always a challenging task like any other sport. To swim you have to increase your power and also reduce the resistance of water.
The swimming power required to overcome the water resistance increases with 1/3 of the velocity power. This means to increase your velocity by 5%, you need to increase the power by over 15%. In most cases, you will need to hire a coach if you want to learn how to swim as a way of sporting.