Oh nice!  I know people swim for recreation, exercise, sport or even survival!  Some swim in salt water, some in fresh water.
I love to swim too.  People will swim in different places including fresh water, salt water, they do it for recreation, sport, exercise, or survivall
I like to swim even when I'm not very good at it.
Swimming is the self-propulsion of a person through fresh or salt water, usually for recreation, sport, exercise, or survival.