EXPLAINER: How 'the twisties' stopped Simone Biles cold
Simone Biles, of the United States, lands from the vault during the artistic gymnastics women's final at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Gregory Bull)

Simone Biles, of the United States, lands from the vault during the artistic gymnastics women's final at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Gregory Bull)

Jul. 27, 2021 08:23 AM EDT
Simone Biles, of the United States, lands from the vault during the artistic gymnastics women's final at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Gregory Bull)

Simone Biles, of the United States, lands from the vault during the artistic gymnastics women's final at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Gregory Bull)

Jul. 27, 2021 08:24 AM EDT
Rosannagh Maclennan, of Canada, competes in the women's trampoline gymnastics qualifiers at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo. (AP Photo/Ashley Landis)

Rosannagh Maclennan, of Canada, competes in the women's trampoline gymnastics qualifiers at the 2020 Summer Olympics, Friday, July 30, 2021, in Tokyo. (AP Photo/Ashley Landis)

Jul. 30, 2021 03:43 AM EDT
Coach Laurent Landi embraces Simone Biles, after she exited the team final with apparent injury, at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. The 24-year-old reigning Olympic gymnastics champion Biles huddled with a trainer after landing her vault. She then exited the competition floor with the team doctor. (AP Photo/Gregory Bull)

Coach Laurent Landi embraces Simone Biles, after she exited the team final with apparent injury, at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. The 24-year-old reigning Olympic gymnastics champion Biles huddled with a trainer after landing her vault. She then exited the competition floor with the team doctor. (AP Photo/Gregory Bull)

Jul. 27, 2021 07:59 AM EDT