Swimming is nice for exercise! It's the self-propulsion of oneself through water.
It really is. I like to swim on hot summer days. It is so refreshing.
It is refreshing! It's one of the top public recreational activities. In some countries, swimming lessons are part of the educational curriculum. 
I think it's very important for kids to learn how to swim as soon as possible. There are too many drownings every year!
Infant swimming
Infant swimming is the phenomenon of human babies and toddlers reflexively moving themselves through water and changing their rate of respiration and heart rate in response to being submerged. The slowing of heart rate and breathing is called the bradycardic response. It is not true that babies are born with the ability to swim, though they have reflexes that make it look like they are. Babies are not old enough to hold their breath intentionally or strong enough to keep their head above water.
Most infants, though not all,
Swimming
Swimming is the self-propulsion of a person through water, usually for recreation, sport, exercise, or survival. Locomotion is achieved through coordinated movement of the limbs, the body, or both. Humans can hold their breath underwater and undertake rudimentary locomotive swimming within weeks of birth, as a survival response.
Swimming is consistently among the top public recreational activities, and in some countries, swimming lessons are a compulsory part of the educational curriculum. As a formalized sport, swimming features in a range of