beamitis
when a gymnast can not stay on the beam at all during a practice they may self diagnose themselves or a teammate may diagnose them with beamitis
“Rachel can not land her back handspring at all today! I think she has beamitis!”
or
“I literally can not make my aerial on beam today I think I have beamitis.”
or
“I literally can not make my aerial on beam today I think I have beamitis.”