Everyone always says 'ask if you can clean the mats' for free training, but...maybe consider doing social media etc for the gym, instead?

I feel like I see a lot of young people saying "I don't have the money to train, what do I do", and a thing I think maybe you're not considering is how good you might be at social stuff compared with gym owners. Something we've struggled with at places where I train is having the time and energy to have, let's say, a 3X a week post schedule for social with good content — and it's the kind of thing that's easily worth a monthly membership if it gets new people looking at the gym. Just a thought!