Cal. CIV § 1812.81

As used in this title, “contract for health studio services” means a contract for instruction, training or assistance in physical culture, body building, exercising, reducing, figure development, or any other such physical skill, or for the use by an individual patron of the facilities of a health studio, gymnasium or other facility used for any of the above purposes, or for membership in any group, club, association or organization formed for any of the above purposes; but does not include (a) contracts for professional services rendered or furnished by a person licensed under the provisions of Division 2 (commencing with Section 500) of the Business and Professions Code, (b) contracts for instruction at schools operating pursuant to the provisions of the Education Code, or (c) contracts for instruction, training, or assistance relating to diet or control of eating habits not involving physical culture, body building, exercising, figure development, or any other such physical skill.