At very best they're a dishonest and unethical business. However, I would consider some of their actions fraud and stealing. I've been with them for 6 years now. They've recently decided to close down my location. I went to cancel my membership and they tell me they're going to charge me $10 and it will take 2 billing cycles for my cancellation to take affect as per the contract I signed. This is dishonest, because they do not disclose these details when you ask them when you first sign up. If you ask them what happens if you want to cancel they wont tell you, and instead ask you a question back like "Why would you want to cancel", "I don't understand why you'd want to leave" and avoid the question. Thats pretty convenient that you guys leave that out.
The fraud comes in with the several "accidental" charges they make to your account. The charged my girlfriend twice for her first month, and they continued to charge her for her tanning package months after she canceled. They charged me for months after I canceled my trainer, even after I payed the ridiculous cancellation fee. The employees say "there is no direct line to corporate", so getting the situation fixed is almost impossible. After digging around the internet to find a number and leaving messages for a month, they tell you "oh we're sorry, our mistake, we'll refund that". This is fraud, they're stealing money, and they're getting away with it if you don't check your account/credit card.
They use very deceptive, dishonest marketing tactics to get you to pay more money. Everybody there pays a different fee. Some pay $15, some $25, one friend of mine even payed $60. This is all for the same service (no tanning, lockers or anything, just the gym). They won't tell you their rates over the phone, they make you come in. The won't let you cancel over the phone, you have to come in. After threating to cancel your addons or service, THEN they decide to offer you a lower price. It's always "the last day" for the sale when you go to join the gym, sign up for tanning, get a locker, or trainer. They do it just to rush your decision.
I'm surprised these guys haven't gotten sued yet. Stay away from them at all costs. They'll lie to your face, withhold information, and STEAL your money if you don't keep eye on your accounts. It'd be different if I had experienced this stuff once, but it seems intentional when multiple people have had the same problem and I've had the problem myself several times.