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Michael Phelps feet is his double-jointed ankles. According to a Detroit News blog, Phelps’ ankles can bend 15 degrees farther than most other swimmers. This exceptional flexibility allows his feet to move more fluidly and generate more excellent propulsion with each kick. When his feet flex, they create a larger surface area, effectively turning them into powerful flippers that push against the water with tremendous force.
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Michael Phelps Feet | The Secret to His Swimming Success
starxbio.com

Michael Phelps Feet | The Secret to His Swimming Success

The unique physical advantage that contributed to Michael Phelps feet' legendary swimming career. Learn how his size-14, flexible feet turned into.