Michael Phelps celebrates winning gold in the Men's 4 x 200m Freestyle Relay Final while wearing a swim cap borrowed from his teammate after his broke. Credit: Photo by Al Bello/Getty Images ...

Here, Michael Phelps shares with Fortune his top tricks ... or a swimmer— somebody wearing a pair of goggles and a swim cap, ...

Michael Phelps swam against ... but it was all simulated. Instead, Phelps raced against virtual versions of the sharks side-by-side based on their swim rate in a separate race.