Ever wonder what a pool full of Olympians training to be the best in the world look like? Well, look no further. At Arizona State University, Bob Bowman (coach of Michael Phelps) has put together perhaps the best training group in history. This includes 5x world champion Leon Marchand, Olympic champion CHase Kalisz, and world champion Hubert Kos (to name just a few). Watch as they train Long Course (Olympic-size pool) on a Saturday morning,.