The Legislature finds and declares that the protection against corporal punishment, which extends to other citizens in other walks of life, should include children while they are under the control of the public schools. Children of school age are at the most vulnerable and impressionable period of their lives and it is wholly reasonable that the safeguards to the integrity and sanctity of their bodies should be, at this tender age, at least equal to that afforded to other citizens. (a) For the purposes of this section "corporal punishment" means the willful infliction of, or willfully causing the infliction of, physical pain on a pupil. This includes, but is not limited to, striking a student on the buttocks with a wooden board or other implement, denial of access to the restroom, forced exercise, harmful seclusion and restraint, forced medication. An amount of force that is reasonable and necessary for a person employed by or engaged in a public school to quell a disturbance threatening physical injury to persons or damage to property, for purposes of self-defense, or to obtain possession of weapons or other dangerous objects within the control of the pupil, is not and shall not be construed to be corporal punishment within the meaning and intent of this section. Physical pain or discomfort caused by athletic competition or other such recreational activity, voluntarily engaged in by the pupil, is not and shall not be construed to be corporal punishment within the meaning and intent of this section. (b) No person employed by or engaged in a public school shall inflict, or cause to be inflicted corporal punishment upon a pupil. Every resolution, bylaw, rule, ordinance, or other act or authority permitting or authorizing the infliction of corporal punishment upon a pupil attending a public school is void and unenforceable.