US winner of eight swimming gold medals Michael Phelps (L) attends a photocall for the Speedo Athlete Media Day with compatriot swimmer Natalie Coughlin during the 2008 Beijing Olympic Games on August 19, 2008. [Agencies]

Australian swimmer Stephanie Rice (L) and US winner of eight swimming gold medals Michael Phelps are pictured during a photocall for the Speedo Athlete Media Day during the 2008 Beijing Olympic Games on August 19, 2008. [Agencies]

US winner of eight swimming gold medals Michael Phelps (C) attends a photocall for the Speedo Athlete Media Day with compatriot swimmers Katie Hoff (L) and Natalie Natalie Coughlin (R) during the 2008 Beijing Olympic Games on August 19, 2008. [Agencies]

US winner of eight swimming gold medals Michael Phelps removes his shirt as he attends a photocall for the Speedo Athlete Media Day during the 2008 Beijing Olympic Games on August 19, 2008. [Agencies]

US winner of eight swimming gold medals Michael Phelps attends a photocall for the Speedo Athlete Media Day during the 2008 Beijing Olympic Games on August 19, 2008.[Agencies]