Olympic swimmer Michael Phelps and coach Bob Bowman

DALLAS, TX - MAY 13: Olympic swimmer Michael Phelps, right, and his coach, Bob Bowman, answer questions from the media during the United State Olympic Committee Media Summit 2012 at Hilton Anatole on May 13, 2012 in Dallas, Texas. 

DALLAS, TX - MAY 13: Olympic swimmer Michael Phelps answers questions from the media during the United State Olympic Committee Media Summit 2012 at Hilton Anatole on May 13, 2012 in Dallas, Texas. (Photo by Brandon Wade/Getty Images)

DALLAS, TX - MAY 13: Olympic swimmer Michael Phelps, right, and his coach, Bob Bowman, answer questions from the media during the United State Olympic Committee Media Summit 2012 at Hilton Anatole on May 13, 2012 in Dallas, Texas. (Photo by Brandon Wade/Getty Images)