Go Back to Work?

Should I do it? I am being recruited by the gym where I teach yoga. They want me to be either a personal trainer or a 'fitness consultant" - which would be on the management track. They are willing to let me work parttime at first... probably 4pm to 9 or 10pm.
It could be lucritive if I am good at it. I don't know, I may suck at it.
The thought of going back to work makes me a little sad.
What to do.....????!!!