Last week while watching the "Duel in the Pool" the US vs Aussie swim meet I noticed that nearly all the flyers were breathing nearly every stroke. I had always been taught to breath every other stroke for 100's. But then I see Michael Phelps (and others) breathing every stroke, except the first one out of the turn and start. And I wonder "what have I been missing ?". Can someone fill me in as to what started this, and what is the thinking behind it.