Section 47A. The superintendent may contract to employ athletic coaches hired under the provisions of section fifty-nine B for periods not in excess of three years. The provisions of section forty-one relative to tenure shall not apply to such athletic coaches, unless they are otherwise entitled to tenure. All coaches shall have a current certification in cardiopulmonary resuscitation from the American Heart Association, American Red Cross or other agency or organization approved by the department of public health. This requirement shall not apply to a coach with a physical disability. A school district that hires a coach under this section shall not be responsible for costs associated with the certification.