I'm not a career change expert, but a few questions come to mind: Have you considered a job change within your field? For instance, I serve on a board with a man who went from being the VP of marketing for a regional bank to working for a company that manufactures mammographers (if that's the right word) and related equipment. He's thrilled with the change. So, is it your field that is bothering you or just your current job?

How does her DH feel about the possible change? How stable is his job? What sacrifices would you have to make? How would it change your long term financial goals? What about insurance and other benefits?

What job in the fitness industry do you have in mind? How sure are you that you would actually enjoy the job(s) you have in mind? Sometimes what we enjoy as a hobby doesn't necessarily translate into the perfect job.

What kind of longevity would the job(s) you have in mind? Is there room for advancement and new challenges? Could you potentially combine your marketing background with the fitness industry?

I certainly don't believe that money buys happiness, but by the same token, financial worries can lead to unhappiness, too. If you can strike a decent balance, then go for it.