
Originally Posted by
Proximal
I have a background in this as well and have my periodization book in front of me as I type this.
Is football a priority, are you preparing for college or professional levels?
Can you afford to put on size without compromising speed, based upon your position?
Bottom line is, what are your goals and when does your next season's training camp begin?
But to answer your immediate question, yes you can hit major muscle groups more than once per week, but you may have to hit them with varied levels of volume/intensity.
Regarding sprints, when preparing for a sport, you typically save the power work like plyometrics or speed work till closer to the season, because this is when you need to start converting your max strength gains from the previous months to functional, sports related movements. This is the premise for periodization, different periods for different goals.