Sara Renner is getting a crash course in normal living. Since announcing her retirement from skiing after her final race—the 30 k race at the Olympics, she’s jumped into the “real life of motherhood and work” with both feet. “It’s really eye-opening the amount of stuff you do in a day when you don’t ski [train],” she said. “It’s so busy!” Renner is now balancing motherhood with a new position—she and her husband, Thomas Grandi,...