Michael Phelps sisters were both competitive swimmers who introduced him to swimming at age 7 as an outlet for ADHD.
Additionally, according to the Wikipedia article on Phelps... "Phelps idolized Australian Ian Thorpe as a teenager, modeling his public image after Thorpe, and later watched videos to try to emulate the Aussie's famous six-beat underwater dolphin kick off the turns"
Most likely it was Mark Spitz.
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