After withdrawing from the 2020 Olympic women's gymnastics all-around final, Simone Biles explained that she made the decision after experincing "the twisties" on her first vault. Although us non-gymnasts might think the name sounds cute and harmless, Biles explained that the twisties are actually a terrifying, and incredibly dangerous, experience, in which a gymnast gets "lost" in the air, cannot tell how they are going to land, and can seriously injure themselves. Head over to BuzzFeed News to read Biles' full explanation of the terrifying experience.