Stories about fitness franchises???

Let me first introduce myself as a man who has spent all of his professional life in the fitness industry. I am very passionate about people's fitness and pursuit of good health. That's why within the last 10 years their has been a spike in the number of fitness franchises available to future entrepreneurs. I think this is a great trend when these fitness franchises are good franchises... So I am asking for your input on this one. Tell me about your good fitness franchise experiences and your bad ones...