i see lots and lots of football players sprinting very long distances which causes exhaustion so the team could end up loosing. Players have died through heart attacks by sprinting too far...i see lots and lots of football players sprinting very long distances which causes exhaustion so the team could end up loosing. Players have died through heart attacks by sprinting too far...

In what League do PROFESSIONAL ATHLETES die because they ran too far? The last NFL player to die on the field was Chuck Hughes, and that was in the 70's. Unless you are talking about the grass fairies in Soccer? But even still they run more than American Footballers do? So in what "Football" do lots of players die due to cardiovascular conditioning?

I will agree that at little-league and even high-school level, you are going to get a lot of "coaches" who are, to be charitable, not exactly up on cutting-edge exercise physiology. They tend to do what they learned, and the guys who taught them learned from their coaches... All going back quite a long way. Mostly tradition and to a large extent outdated. We still see people doing "cold" stretching drills and "ballistic" stretching which research over the last 20 years has found to be not only ineffective but downright harmful. A lot of high-school level coaches have degrees in Physical Education, which generally qualifies the holder to teach how to play various sports, administer phys-ed tests, and such-like. Advanced exercise physiology is generally not encountered till you get to college-level sports.