Swimming is good for health. It requires all the body to move.
Yeah, swimming is the self-propulsion of a person through water for recreation or sport.
In competitive swimming, only 4 styles have been established : butterfly, backtroke, breastroke, and freestyle.
Oh, I didn't know that. Locomotion is achieved through coordinated movement of the hands and feet.
Different part of the body, among others the head, must be placed in a specific angle.
That is true. Humans can hold their breath underwater within weeks of birth, an evolutionary response.