It'll help with overall performance. It allows oxygenated blood to travel through your body for longer durations. When you start to exercise/expend more energy than normal, your body demands more oxygen. The longer you can provide oxygenated blood to your body, the longer you can perform; i.e. running with a football. When you start using more oxygen than you are taking in, your body is stuck with to much lactate in the blood. You generally see this when someone has to stop running and is gasping for air. They are trying to blow off the excess CO2 and take in more oxygen.
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Football as in American because if you are talking about that kind then because you have to go up against 200-300 pounds guys trying to tackle you when you're running.
If you're talking football as in soccer then you have 90 mins. of pure running/sprinting/jogging with no time outs or stopping of the clock. I mean if you're not part of the play then you get a little bit of a break to jog up the field to get with the play but still, you have 90 minutes of running.
Hope this helped!!!
it helps strengthen muscle tissue, and it helps the body supply oxygen to muscles and cells (builds more stamina)