![]() “We are essentially giant springs as we run,” says Geoffrey Burns, PhD, a sports physiologist at the U.S. The premise of the Alphafly is simple, says Carrie Dimoff, a Nike director of innovation who leads the Alphafly development team: “If we can store more of your energy and return more of that energy, you can run more efficiently.”Īll of running is energy maintenance, from our shoes to our stride. But how, exactly, does that system translate physiologically to the fastest marathon ever run? Biomechanists are still figuring that out. And it retains the mechanically familiar block of responsive foam stabilized by a heel-to-toe carbon-fiber plate. The Alphafly, with its air chambers, is an obvious evolution from the Vaporfly. ![]() Eliud Kipchoge wins the 2022 Berlin Marathon with a time of 2:01:09, a new world record.
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