Before long, Armbruster had encouraged all of his swimmers to use it in place of the breaststroke’s traditional frog kick.

Thornton has worked with Prenot, a senior majoring in physics who swims for Cal, to alter his breaststroke’s traditional frog kick.

Both animals used a leg movement similar to the breaststroke "frog kick", according to a report in the American Journal of Physical Anthropology.