You can learn a lot about a subculture by the slang it develops. Gymnastics has a lot of slang around fear: the twisties, headcasing, mental block, bailing, balking. Gymnastics is obviously physically demanding with a high injury rate. But it is extremely difficult psychologically as well. Many of the skills could kill you. When Kevin Durant's foot was off by an inch in Game 7 of the NBA's Eastern Conference semifinals, his shot was worth two points instead of three, and the Brooklyn Nets lost in overtime. When Riley McCusker's foot was off by an inch on her beam dismount at the 2017 American Cup, she slammed backward onto her neck and then rolled over it.