No person shall appear as a contestant in any amateur boxing contest who has received any compensation or reward, except for actual expenses or trophies, in any form, for displaying, exercising, or giving any example of his or her skill in knowledge of boxing exercises, or for rendering services of any kind to any boxing organization, or to any person or persons as trainer, coach, instructor or otherwise, or who shall have been employed in any manner professionally by reason of his or her boxing skill or knowledge.