Utilizing Me

Here’s my predicament:
I’m just about in college. Since childhood, being in the military was the only career I truly wanted. But over the past years, that has faded. I don’t konw exactly what it is I want.
The one then I cant imagine is letting my body go to waste. Im healthy, strong, and a natural runner. I dont think I could stand having a job thats not physically strenuous. When Im doing wrestling or cross country, it feels so right to exhaust myself.
So the military seems like a good path for the reason that it would be a challenge. But dedicating at least 8 years and possibly my life to an occupation Im not fully enthusiastic about doesn’t seem quite right.
So, here’s the question: Any other occupations out there where I would fully utilize my body?