Obviously I never seen you in my life, but if you are a big guy, yea, be a lineman or D-line.

You simply want to replace your fat with muscle and increase your stamina by running.

In the gym, do a full body workout, but also emphasis on a lot of squats, shoulder/strap exercises and chest. I would lift weights five times a week, and in 7 weeks, in combination with a combination of intense running, and long-distance running. Intense, I mean like run full speed on shuttle drills for 5 minutes straight, rest for 2 and do it again If you can't do a full five minutes at first, start at how long you can run until you practically pass out, and build it up. Full intensity exercise work more of your muscle fibers than doing a mediocre intense exercise and increases your endurance faster. But remember, the quality of your methods are equally important, don't shortcut. Just make a plan, stick to it, and you'll be more than ready for football season. Drink lots of water and don't try to smoke cigerettes