COLLEGE PARK, MD - AUGUST 8: Bob Bowman, right, coach of the North Baltimore Aquatics Club from Maryland jokes with Michael Phelps as he...

U.S. swimming star Michael Phelps, left, walks with his coach Bob Bowman during a training session at the Susie O'Neil pool for the swimming events at the...

Bob Bowman

BEIJING - AUGUST 06: Coach Bob Bowman of the United States swimming team attends a press conference ahead of the Beijing 2008 Olympics...

BEIJING - AUGUST 06: Michael Phelps (L and coach Bob Bowman of the United States swimming team attend a press conference ahead of the Beijing 2008 Olympics...

BEIJING - AUGUST 06: Michael Phelps (L and coach Bob Bowman of the United States swimming team attend a press conference ahead of the Beijing 2008 Olympics...