American Simone Biles is widely considered to be the greatest gymnast of all time. In the United States, she is the “face” of the Tokyo 2020 Olympics. When the games began, she was expected to win five gold medals. But on Tuesday, she pulled out of the team final. She made the choice after having trouble landing her vault in the competition’s first round. She later said her mind was not in the right place to let her safely perform the difficult moves she is known for. In other words, her mind was not letting her body do what it needed to do. Cameras caught her telling her trainers Tuesday during the team final, “I just don’t trust myself.” So, she made the decision to protect her mental health and, she said, to give her teammates a better chance at earning a medal. Biles’ three teammates went on to place second behind the gymnasts representing the Russian Olympic Committee. Biles is not the only Olympian in recent months to talk about the pressure and mental effects of competing at the highest level. Japanese tennis star Naomi Osaka decided not to compete at the French Open earlier this summer. She made that choice after French Open organizers were critical of her decision to not speak to the media during the event. She made that decision, she said at the time, to protect her mental heath. This week, Osaka lost in the second round of Olympic competition. She said she felt extreme pressure to win for Japan, where the Olympics are taking place.