1. If "gym" is used as a proper noun, referring to a specific name or title, it should be capitalized.
For example:
- I am a student at Gold's Gym.
- The school has its physical education classes at the Community Gym.
2. On the other hand, if "gym" is used as a general noun, referring to a type of facility or place, it should remain lowercase.
For example:
- I need to go to the gym to work out.
- Students should exercise regularly and engage in gym activities.