Yoga Classes in Watertown Square Wednesdays 6:00 - 7:00 P.M. (intro. level) and 7:30-9:00 (continuing level). Whether you need strengthening or flexibility, relief from stress, pack pain or tight shoulders, you can benefit from these classes. Intro. class: $12. Continuing level: $16, payable by series. Sandra is certified by the Krishnamacharya Healing & Yoga Foundation (KHYF) and the American Viniyoga Institute of Maui as yoga teacher and yoga therapist. She has taught yoga and stress maagement since 1995. Sandra focuses on therapeutic effects and adapts yoga to the individual's needs. Patanjali's yoga sutra-s form the foundation for her teaching.