Michael Phelps prior to Men’s 100 Meter Butterfly competition at USA’s 2016 Olympic Team Swimming Testing....

Michael Phelps prior to Men’s 100 Meter Butterfly competition at USA’s 2016 Olympic Team Swimming Testing....

Michael Phelps could go after 10 medals at the 2012 Games. (Getty Images)

Source: Michael Phelps to enter seven events at U.S. Olympic swimming trials

Michael Phelps could go after 10 medals at the 2012 Games. (Getty Images)

Butterfly king: Michael Phelps' reign explained - Telegraph

Butterfly king: Michael Phelps' reign explained

Scientific Analysis Of Michael Phelps's Body Structure » Science ABC

Scientific Analysis Of Michael Phelps's Body Structure » Science ABC

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