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NOTE: SWIMMING

strokes a fast, powerful, strong crawl a slow breaststroke do, swim (the) ~ a swimmer doing the crawl I can't swim butterfly.

strike out in/with breaststroke/crawl She struck out with a strong crawl towards the shore.

a length of ~ He did 15 lengths of backstroke every morning.

In competitions the categories are backstroke, breaststroke, butterfly, and freestyle (= in which competitors do crawl because it is fastest). 100 metres, 200 metres, etc. ~ men's, women's ~ compete in ~ competing in the women's 100 metres freestyle

in the ~ He came first in the 200 metres backstroke.