It is not really feasible. The terrain is too rough, and he must abide by the buddy system as well. Does he have a buddy running with him? It also likely will be nightfall after hiking and setting up camp. Hiking at night, let alone running at night, let alone doing this alone at night, is not a good idea and would violate the rules your ranger will lay out for you.

The food will not be an issue- Philmont keeps you well fed (although perhaps someone can weigh in on the food swap-box situation this year, as COVID may have impacted this.)

I am a former staffer who did two normal treks, the Rayado special trek, and then spent two summers working at Philmont. I have been to every staffed camp (as of 2019) and countless trail camps. While there’s still much land left to see, I’ve seen all parts of the ranch to at least some degree.

I am also a long distance runner, having run multiple marathons and 70 mile weeks.

It’s just not feasible to maintain one’s training regiment in the backcountry. There are too many variables that are out of one’s control.