Need extra cash? Teach celebrity-branded exercise classes

With unemployment still climbing and wages stagnant at best, many Americans are looking for ways to increase their incomes -- often by looking to their hobbies for a source of cash.

Elizabeth Freedman, the author of Work 101: Learning the Ropes of the Workplace without Hanging Yourself and an aerobics instructor who teachers programs including Zumba and Body Pump, said in an email that "Brands attract gym-goers. Gyms are always looking for ways to draw in new members, and offering a full schedule of branded, well-recognized classes helps in their effort. As a result, instructors who are able to teach these programs are more likely to find opportunities to teach, and those who aren't certified in one of these areas may find they have significantly fewer places to work."