Jon Jones was a bouncer and almost became a Janitor full time.
Jose Aldo would pursue a career in professional football if he wasn't doing MMA.
Demetrious Johnson worked another job for part of his UFC career.
Now Demetrious is also making money through his Twitch account.
Stipe Miocic was and continues to be a firefighter.
Georges St-Pierre says:
A lot of the jobs I used to do were terrible. I used to work security in a hip-hop night club. It was a lot of [fighting], a terrible job. It was a depressing job.
I used to work in a grocery store—it was bad.To pay my university [bills], I worked as a garbage man for six months. That was not so bad, actually.
That was actually one of my most fun jobs.
GSP used that job as a training tool.
Frankie Edgar was a plumber for his dad's plumbing company.
Conor McGregor worked as a plumber too.
So did Court McGee and Jeremy Kennedy.
Paige Vanzant was a dancer and also appeared in some advertisements.