dolphin kick
n.— «In layman’s terms, the dolphin kicks is an emulation of the way a dolphin cuts through the water with its flipper. Swimmers that use the dolphin kick replace a standard underwater “freestyle” kick with an explosive undulating motion powered from the swimmer’s core muscles.» —“Michael Phelps Writes New Chapter in Dolphin Kick History” by Scott Timed Finals Apr. 9, 2007. (source: Double-Tongued Dictionary)
Further reading
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