I borrow this photo from Colts.com, so I won't be complaining much about the quality of the photos.
Sports photography is challenging, pretty difficult to get great pictures since subjects are moving everywhere. Football is a notch harder I believe. Aside from the moving part, a photographer has this whole field in front of him with bunch of subjects making it very hard to focus. So I understand. In this case, the picture on the left, I will leave it alone. I got it from the website initially to use it for my pre-season blog, but oh well.
I remember photographing my very first football game in my life at Ball State--damn, it was a trip to pure disaster. A large field was one thing, but knowing nothing about football was a big deal. I recall a 400mm lense flying left and right not knowing what was going on. The next thing I noticed was a TV guy laying on his back gotten hit by a big linebacker.