As a prerequisite to renewal of a license or reinstatement of a license, each physical therapist shall be required to take biennial courses relating to physical therapy as approved by the Board. The Board shall prescribe criteria for approval of courses of study and credit hour requirements. The Board may approve alternative courses upon timely application of any licensee. Fulfillment of education requirements shall be certified to the Board upon a form provided by the Board and shall be submitted by each licensed physical therapist at the time he applies to the Board for the renewal or reinstatement of his license. The Board may waive individual requirements in cases of certified illness or undue hardship.