Simone Biles Had the Terrifying ‘Twisties’ Before Withdrawing From Olympics Competition “If you are not 100% sure of yourself, and where you are in the air, it can be very dangerous.” Jul 29, 2021 The world was stunned on Tuesday when gold medalist Simone Biles pulled out of the Olympic team gymnastics competition after fumbling her vault. Biles, 24, later explained that she was struggling with a mental performance issue that’s commonly called “the twisties” in gymnastics. “I just don’t trust myself as much as I used to,” Biles said in a press conference after Team USA took home silver. “I’m a little bit more nervous when I do gymnastics. I feel like I’m also not having as much fun.”