STW 911 Krav Maga Be the Threat! Get in shape and go home safe with us. Serving the San Antonio location for over 11 years. With 2 locations to choose from we offer a wide variety of fitness, self defense and specialty classes. View class schedules and instructors and any important schedule changes made. See current announcements and member specials. Rate your classes and instructors. Offer valuable feedback so we can bring you the best fitness and self defense classes in the area.