Extreme Core Pilates of Sudbury. Massachusetts is a boutique Pilates studio that offers best-in-class Pilates Mat and Reformer classes, as well as Active Isolated Stretching, TRX, Meditation, and ECore Barre sessions for groups and individuals. Founder Kathy Clark has over twenty-five years of experience in health, sports, and fitness instruction, teaching a variety of exercise modalities across the globe since 1988. She has over 200,000 hours of sports and fitness instruction, athletic training, rehabilitation, and prevention programs, with certifications like STOTT Pilates Mat and Reformer, Body Training Systems, and Aaron Mattes Method. Courses include varying levels of Pilates Reformer, Cardio-Tramp Interval Training, and Active Isolated Stretching.