Yoga for Treating People at Risk for Diabetes or With Both HIV and Depression

In recent years, western health practitioners have become increasingly aware of the potential health benefits of yoga. This study will comprise two substudies that will evaluate the effects of yoga in two distinct populations. Participants in the first study will be people who are at risk for developing diabetes; participants in the second study will be people with both HIV and depression. All participants will practice yoga 3 to 6 days per week for 3 months. Blood collection will be done and weight and blood pressure measurements will be taken in study 1 participants; questionnaires will be used to measure depression and stress in study 2 participants. All study participants will be assessed at entry and at 3 and 6 months.