11. Naïve to study interventions. Participants cannot have had > 4 single sessions (or > 8 total hours class time) of yoga, other classes in "mindful exercise," (e.g., qigong, tai chi), mindfulness based stress reduction, or health education in the past year or >8 single classes of yoga within the past 2 years of the same. Participants can not have practiced yoga at least once per week for 8 weeks in a row in the past 5 years.