Lots of questions and comments here...
Firstly, the procedure is give me a call.
As for why gyms charge, here ya go...
Rent, insurance, affiliation fees, utilities, equipment etc. I know you guys already knew all of that, but mostly the issue is that the other students pay monthly contract rates. If you spend your hard earned money and commit to a contract for the annual rate of $1200-$2000 I'm fairly certain you wouldn't like someone getting a week or more for free. I wish I was able to do all of this for free. Trouble is I'm not :/ All that being said, I am a VERY fair guy. Whatever I choose to charge a visitor is always fare and economically realistic... Have no fear. First lesson is always free and I'm always willing to help a guy out. Gimmie a call. Anytime.