Yes, there are a variety of "jobs" a bodybuilder or fitness model can do, such as the ones listed.
Some will also get work as physique models. Some also get sponsored for endorsing supplements, but that only applies to a few pro's.
This does not only apply to Pro Bodybuilders. There are many amateur bodybuilders who make more money from endorsements than most pro bodybuilders ever will. It all comes down to marketing. Some guys and girls are really marketable. Matt Duvall, for example, had sponsorship deals 10 years before he turned pro because he had a marketable look. And now Chris Cook is the new pretty boy because he has spiked bleached blonde hair. He looks pretty good but there are far better physiques.
So a lot of people do it based on what their body (and face, hair, etc.) looks like, Pro or not. and others (established bodybuilders) use their name (Jay Cutler, Ronnie Coleman, etc.).
As mentioned, prize money in bodybuilding is very low and only a few get it. Sometimes it does not even compensate the cost of contest preparation, many times that is the case, actually. The real money is in the product/clothing/supplement endorsements.
I've been sponsored by a few companies currently and in the past. I pretty much only get free supplements, clothing, lifting gloves, etc. Others, involve cash, and sometimes lots of it, deals worth six figures, I dont' know the details but over $100,000 are not too uncommon for Weider athletes and I imagine Muscle-Tech guys are the same.
Modeling can go well too. I've done a bit of that, but at the level I've done it at, it doesn't bring in much money.
Basically bodybuilders/fitness athletes can do any jobs just like anyone else, but they do have that special look that is needed in some movies, photo shoots, TV shows, etc, as mentioned already as well.
I agree with Tarz that most will have to have a regular job as well. Bodybuilding alone will probably not be the sole income for many, unless they have books, videos, clothing products out there and have a nice endorsement contract.
Most do it to be healthy, for a hobby, and because they have goals and set a high standard for themselves athletically, everything else like publicity and attention and money are secondary.