I teach yoga and work in a nursing home doing physical therapy.
Both required lots of training...that being said...neither are great for single mammas as far as I've experienced so far.
Healthcare requires unpredictable hours, vaccinations (which i have so far skirted around) and uses all of my energy.
Yoga is something that I LOVE with all of my being. I've been doing it for about 10 years and teaching for about 2 formally and 3 informally. In order to make a living teaching yoga I have found that unless you are in a major city centre you need to teach when people are not working...evenings. With my four year old, I have a very hard time finding someone to watch her during these times. It really is impractical to bring her to class. I have, but it doesn't always work.
but, just sharing my ever so pesimistic thoughts (gosh...so unlike me