Researchers randomly assigned 30 people with major depressive disorder to partake in either a “high-dose” or “low-dose” yoga program. The high-dose group participated in three 90-minute yoga classes each week along with home practice, while the low-dose group engaged in two 90-minute yoga sessions each week in addition to home practice. The researchers found that those who took three weekly yoga classes had fewer depressive symptoms than those in the “low-dose” group, but they added that even two classes a week provided positive mental health benefits. Journal of Alternative and Complementary Medicine, March 2017