What you describe is more of a sports shot
Environmental portraits just tend to be a straight portrait, shot outdoors in a pleasant setting instead of a studio, but all the lighting rules apply.
Key light, fill light, etc.
http://digital-photography-school.com/environmental-portraits
As you can see from the above link, it can also mean shooting the subject in their environment, usually working or relaxing.
I would avoid shooting your subject that could be mistaken for a sports, action or glamour shot.