Every contract for physical fitness services shall be in writing and shall be subject to this Act. All provisions, requirements and prohibitions which are mandated by this Act shall be contained in the written contract before it is signed by the customer. A copy of the written contract shall be given to the customer at the time the customer signs the contract. Physical fitness centers shall maintain original copies of all contracts for services for as long as such contracts are in effect and for a period of 3 years thereafter.