X-Nico

Butterfly stroke

One year later, in 1935, Jack Sieg, a swimmer also from the University of Iowa, developed a kick technique involving swimming on his side and beating his legs in unison, similar to a fish tail, and then modified the technique afterward to swim it face down.

Maria Lenk

Lenk's account of the event was that at the time she subscribed to a German specialized magazine that ran a story on David Armbruster's and Jack Sieg's work in developing "a new way of swimming the Breaststroke".

see also