Affiliate Marketing Secrets

I went to college for exercise science. I am now in med school. I loved exercise science, but didn’t like the idea of being a personal trainer for financial reasons. So I went to med school. Now I find myself missing exercise science and using my own ingenuity and talents to enhance the performance of healthy athletes in creative ways.
Are there any careers like this available for a physician? Is there any niche I could create for myself? I am afraid there aren’t…I think my best option would be in a teaching role at a college with consulting gigs on the side, and maybe moonlighting at emergency rooms as a physician for the money. I would like to hear people’s ideas about how I can make the best use of my MD while also doing what I love.