http://www.wsj.com/article_email/rio...NzE3MDAxMzA0Wj

But coaches in the U.S. have put on their lab coats. Nort Thornton, the former longtime swim coach at the University of California-Berkeley, spent several years after his 2007 retirement studying the breaststroke.
[...]
He used to encourage breaststrokers to get bigger and stronger to muscle themselves through the water. But Thornton has done a flip-turn on the subject. He now believes that perfecting technique is far more important than spending extra hours in the weight room.