Hi, enroll - A fomal word. Sounds like you are talking about something important. sign up - Informal.
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tmn111I want to enroll to the gym.To my ear "enroll" is too formal for use in this context. I would say "join the gym" or "join a gym" depending on the situation.
I want to sign up (to? for?) the gym.
Or is "join the gym" the only possible solution?