Each session is 90 minutes of individualized vinyasa yoga sessions. Birchrunville Yoga is a transformational vinyasa yoga program dedicated to helping others build core strength, increase flexibility, and become more mindful in their practice and daily lives. Susan Naylor-Emlen, Ph.D., is a psychologist and yoga teacher. Having danced professionally in the Philadelphia area, Susan’s yoga training was a natural extension of her classical dance background. For over 15 years, she was also a fitness and wellness coach.