The idea of opening a gym is good, but no matter what project you go to, you must have a preliminary market survey. According to my understanding of school consumer groups, it is feasible to set up catering snacks and leisure and entertainment projects around the school.
The consumers of fitness programs are not teenagers such as students, but consumers over the age of maturity are relatively large, which should be near high-consumption people such as office buildings and shopping malls!
So I suggest you reconsider!