This is a big room. What do people usually do there?

This is a big room. People usually go there for physical exercise.

This is a big room, where people usually go to do physical exercise.

The answer is the gym. The gym. It's short for gym.

gymnasium

[English] [dm ne？ Son? M][ America ][dm? nezi？ m]

Gym, gym; Pre-university, high school;

Plural: gymnasium

Bilingual example:

He goes to the gym to practice every day.

He goes to the gym to train every day.

Well, I jog every morning, eat a healthy diet and go to the gym twice a week.

Oh, I jog every morning, eat normally and go to the gym twice a week.