@kaarme He could be like me, where running is far more exhausting than any other exercise for some unknown reason.
I can bike, hike, swim, play sports, or do just about any other exercise for hours, but something about running makes me get tired within just a few minutes.
@DrHizzle Eh. Cooper test is 12 minutes. Anyone should be able to run at least that long. Unless Maika is super powerful and was running so fast it was like 5 minutes of pure sprinting for the dude. But I don't recall this being that sort of manga.