This episode contains mentions of sexual abuse.\n\nSimone Biles, 24, showed up on the national stage at 16, when she competed in and won the national championships. She equally impressed at her first Olympics, in 2016 in Rio.\n\nGoing into the Tokyo Games this year, Ms. Biles \u2014 who is considered one of the greatest gymnasts of all time \u2014 was expected to win the all-around. So she shocked many this week when she pulled out of the competition.\n\nWhat prompted her decision?\n\nGuest: Juliet Macur, a sports reporter for The New York Times.