Took a year long snail mail correspondence course 30yrs ago with self realisation foundation in LA. Paramahansa Yogananda founded it in the 1930s. Raja and Kriya yoga techniques. In a busy life made time for daily 10min morning practice (with lapses of course) and continued study. Lower anxiety immediate benefit. Only after 25yrs practice and lengthening daily sessions now experiencing more profound feelings (or maybe I’m just a slow learner)