Seconds after winning an Olympic gold medal, most athletes don't start dreaming of the next one. But Kerri Walsh Jennings does. At the 2012 Olympics, in a patch of sand spread near Buckingham Palace, Walsh Jennings and her playing partner, Misty May-Treanor, had just clinched a third straight beach-volleyball gold. May-Treanor was planning to retire, but Walsh Jennings was sure she still had something left. And so while exchanging postmatch hugs with their vanquished opponents, fellow Americans April Ross and Jennifer Kessy, Walsh Jennings whispered to Ross, "Let's go get gold in Rio."
"I have no idea where it came from, truly," Walsh Jennings says now, sitting on the sand in Manhattan Beach, Calif., before a June practice. "Something deep in my subconscious was just like, You're going to want…
