noun
training center
A facility equipped for physical training, sports practice, or skill development.
新しいトレーニングセンターには最新のマシンが揃っている。
The new training center is equipped with the latest machines.
Variant with interpunct; less common in running text.
ジム is a more casual, general term for a gym or fitness club, while トレーニングセンター often implies a dedicated facility for serious training.
Wasei-eigo (Japanese-made English) from 'training' + 'center'.