Recently had a similar discussian with an Australian-German who went to elementary in Australia and a German life guard and the “how” is certainly interesting as well. Apparently, you get drilled to crawl in Australia (which is just called “swimming”) because that’s the only style that’s powerful enough to save your life in the face of strong ocean currents. Meanwhile, Germans start by learning the breast stroke in elementary because it’s the most efficient/least tiring form of swimming and the most dangerous water scenario here is people swimming too far out into lakes in forests in the middle of nowhere with no life guards, so the no. 1 priority is stamina to get you back on shore.