(4) Health spa service, which includes contracts for instruction, training, or assistance in physical culture, body-building, exercising, reducing, figure development, or any other similar activity or for the use of the facilities of a health spa, gymnasium, or other facility used for any purpose described in this division, or for membership in any group, club, association, or organization formed for any purpose described in this division. "Prepaid entertainment contracts" do not include contracts for services rendered by any public or private nonprofit school, college, or university; by the state or any of its political subdivisions; or by any nonprofit religious, ethnic, or community organization.