Why Kevin Durant’s Achilles Tendon Was His Achilles’ Heel

You can watch Kevin Durant tear up his Achilles tendon in gif form if you want. It’s all over the internet—the Golden State Warriors’ scoring machine bouncing the ball between his legs in an attempt to get past Serge Ibaka of the Toronto Raptors, pushing off his right leg and pivoting on his left, showing Ibaka his back. Then when Durant puts his weight back down after the turn, something’s wrong. He has felt a pop, like getting hit in the back of the leg. Durant limps off the court. He’d later report on Instagram that, yes, his right Achilles tendon had ruptured, that he had gotten surgery to repair it, and that he wouldn’t be playing basketball for a …

The Science Behind Nike’s New, Even Faster Marathon Shoe

At Sunday's London Marathon, Eliud Kipchoge, the greatest marathoner on earth, will toe the line in what could become the most controversial shoe his sport has ever known: Nike's ZoomX Vaporfly Next%. Long anticipated by the sort of runner who devotes his free time to scouring Facebook groups, Instagram pages, and online message boards for news about foams, colorways, heel-toe offsets, and inventory restocks (and who is willing to part with hundreds of dollars to gain a competitive edge), the Next%, which was unveiled this week, is the successor to Nike's Vaporfly 4%—a shoe the company claims can make runners 4 percent more efficient on their feet, translating to precious minutes over the course of a race like the marathon. …