Nike’s Air Zoom Alphafly Next% running shoe is displayed in New York. (AP)
Marathon runner Eliud Kipchoge from Kenya wears Nike AlphaFly prototype running shoes. (AP)
Runners wearing Nike ZoomX Vaporfly NEXT% shoes compete in the U.S. Olympic Trial marathon. (AP)
Nike Air Zoom Alphafly NEXT% shoes on the feet of the winner of the Men's U.S. Olympic Trial Marathon. (AP)
Eliud Kipchoge wore a prototype of the shoe when he ran the world's first marathon under two hours. (AP)
Can shoes make you fast? Many runners are trying out a new kind of sneaker.
The shoes have carbon fiber plates in the soles. These add spring. They help runners move forward faster.