Was your position as a professional athlete more of a job, or just a leisure activity? If it was a job I would but it in non-healthcare employment. If not I would put it in extracurriculars. Put the name of the company as the organization you were affiliated with as an athlete.
For instance, in my extracurriculars I was a varsity college athlete. I put the organization as the university and the supervisor as the head coach. I calculated my time by considering how many hours per week we practiced and multiplied that by the weeks of pre-season and semesters I was involved. I did not include hours for the games.
I think it would be good to put major awards in the achievements section. It would show your commitment to your sport and ability to excel.