You could take a specialized Yoga teacher training intensive for each ailment, a group of ailments, or take an online course. If you have the time to leave work for a specialized continuing education course, you have no worries, but what if your employer is not very understanding about taking time off?
If you teach Yoga part-time, or full-time, you are aware of a core group within your classes. These are students who you can set your watch by. As a Yoga instructor, you feel there is nothing better than teaching a Yoga session with students who appreciate the rewards of regular practice.