Swimming is a type of stroke that can either be butterfly, backstroke, breaststroke or freestyle. There are meters that you have to swim too. Like, If you have a 25 meter pool
… that would mean that you would have to swim two laps to go there and back and that would be called 50 meter. If you wanna do 100 meters that's 4 laps. If you have a 50 meter pool, you just go one lap and that's 50 meters and if you were in a 25 meter pool it would be two laps but its a 50 meter pool. If you swim long distances like the 1500 freestyles or the 400 IM or even the 800 Freestyle you really want to take advantages of the walls, when you turn to do the other lap because you get one full breath that helps you for the underwater part. When you do the butterfly and you do the 400 IM you take advantage of your walls because that big full breath. 50 meters is good for short distances and not for long because you really want that breathe off the wall. And the 50 meter pool is good for 50 meters of freestyle, butterfly, backstroke and breaststroke. All of the strokes. People say that the breaststroke is relaxing and calming but, it does get tireing ( Full Answer )