“Joy and performance are not mutually exclusive,” said Alexi Pappas. She was one of many runners standing out at the starting line of the New York City Marathon.
A new Adidas model carried a runner to a world record. Athletes say they can feel a difference, but it comes with a high price tag and wears out quickly.
Group running has exploded in New York City. As friendships, marriages and even rivalries emerge, the benefits are proving as social as they are physical.