Executive Annual Membership to the St. John Siegfried Health Club. At St. John Siegfried Health Club, we recognize that your healthy lifestyle begins with a healthy body and mind. That's why we offer a complete spectrum of medically-based exercise and wellness options developed specifically to meet your personal health needs. Enjoy the best in fitness and wellness at St. John Siegfried Health Club. Our recently renovated 72,000-square-foot fitness and wellness center is located in the heart of mid-town Tulsa. We offer specially-designed programs for people of all ages and fitness levels. Mary K. Chapman Health Plaza 1819 E. 19th Street (918) 744-2484 Monday - Thursday, 5:30 a.m. - 10 p.m. Friday, 5:30 a.m. -- 9 p.m. Saturday, 6:30 a.m. - 5 p.m. Sunday, noon - 6 p.m.