What is the purpose of creating different swimming stroke, what its use for?
I can’t answer about all the different strokes but some are used for resting while still moving. Treading water is a resting stroke Floating is another way to rest but some find it hard to float. Normal swimming like we all do sometime or another wears someone out, while the side stroke used when holding another person allows you to hold swim and when you tire change side and keep going. Each stroke has some benefit but you do have a point some of them seem useless.
