also: アスレチックトレーナー
noun
athletic trainer
A professional who works with athletes to prevent, assess, and treat injuries, and to improve physical conditioning. In Japan, the role is similar to that in the US, often requiring certification.
彼はプロ野球チームのアスレティックトレーナーとして働いている。
He works as an athletic trainer for a professional baseball team.
アスレティックトレーナーになるには、専門の資
To become an athletic trainer, you need a specialized certification.