I was a pretty good sprint swimmer in highschool. I only swam freestyle and 200y or shorter. I was climbing a horizontal ladder in the water (figuratively) and that made me very quick. But I had a cross-kick, where every time my body rotated, I’d kick twice, my legs would cross at the ankles once.
In practice though, all of the “kicking only” drills I was almost the slowest. It’s more about keeping the body in position for the least amount of drag possible imo.
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