First of all watch this collage video of AP in college (his style is unchanged in the NFL)........He basically runs totally upright virtually all the time. Tacklers go for his feet, many times missing, other times just slipping off. RB's in general are encouraged to keep shoulder and head low, and eyes up so that when you're about to get tackled you can "explode" upward into the defender......that way knocking them off balance instead of you. The way to counter an upright runner is bury the helmet into his chest. No, Smith, I didn't say bury your head up his ass. I wouldn't want to deprive you of the pleasure of maintaining yours in the usual position.......not even for a short while. Going on, I hope that someone will be focussing in on techniques to bring down this less common style of runner.