Each school board employing thirty or more teachers may employ a supervisor of physical education for the schools under its jurisdiction whose qualifications for service shall be established by the state board of education. The supervisor of physical education, under the direction of the superintendent of schools of the district, shall supervise the teaching of all subjects related to physical education and the physical well-being of the children under his charge, direct the supervised play and gymnastics in the schools and control school athletics. School boards employing thirty or more teachers may employ, or otherwise provide or secure the service of, a supervisor of health and of one or more school nurses, who shall serve under the administration of the superintendent of schools of the district. If the supervisor of physical education is qualified to perform the duties of supervisor of health, he may perform the duties of both offices. All duties performed by the supervisor of health or the school nurses shall be performed with the advice and cooperation of the director of the state department of health and senior services.