This is the 1133rd most frequent Japanese word.
トレーナー
Trainer.
In this sentence, 'トレーナー' refers to a type of clothing, specifically a sweatshirt.
トレーナーを着てジョギングに行きました。
I wore a sweatshirt and went jogging.
Here, 'トレーナー' is used to mean a person who trains, typically referring to a coach or fitness instructor.
ジムでトレーナーの指導を受けました。
I received guidance from a trainer at the gym.
In this context, 'トレーナー' indicates the role or job title of a person responsible for training others, not necessarily in a fitness setting.