The arms are moved in a circular motion akin to the butterfly stroke.
At the age of 26, he had given up freestyle, and placed his efforts in the newly created butterfly stroke.
Two striking bodies were swimming after the big man, lifting themselves rhythmically out of the water with the butterfly stroke.
He does a dog paddle, then the butterfly stroke for a minute or so.
Another son, Sydney, was the originator of the butterfly stroke.
The butterfly stroke has three major parts, the pull, the push, and the recovery.
This was the first time that the butterfly stroke had appeared in the Olympic Games.
For the first time, the butterfly stroke was contested as a separate event.
This race consisted of four lengths of the pool all in butterfly stroke.
The water starts to chop, the steady breathing of her butterfly stroke interrupted.
