Although you can make money by teaching yoga, being a hairstylist, birth doula, to make really good money, you need to own your own business. So you won't make a lot of money teaching yoga, unless you happen to do it at your own studio, where other teachers work for you. Similar things can be said for being a hairstylist and similar professions.
If you are willing to work with your hands, I know that there is a huge shortage of metal working skills in the gulf coast and other parts of the country. Welders and pipe fitters are in huge demand, and are raking in the cash. However, most employers will want you to have a certification. In my area, that requires about 2 years of vocational learning at the local community college. Since it is vocational, there is a mix of hands-on learning, but there is also a classroom component.