I was browsing dukeblueplanet and saw a the Duke Sample Workout Program and thought I would try it out.
http://www.dukeblueplanet.com/content.asp?tid=120
Let me tell you it is no joke. I am not in the best shape but I am not in bad shape by any means and this workout is just too much for me. I tried it out for a couple of weeks and I have even more respect for how much work the players put in just to be ready to go on gameday.
I suggest trying it out, it may have the same effect on you.