can i join on line?

No sadly

Nope

Go to the Membership Desk

I don't think so as a photo is required on the membership card

I believe you can IF there's someone, a Manager, available at the Cashier. The BEST way that I'd highly recommend is to just go at the Membership Desk. You could also ask for a Free-Day trial IF you're undecided to join. I hope that helps.