I will qualify this by disclosing that I am not a physicist. However, am I insane, or does a QB sneak with two guys pushing him from behind not make more sense than, well, pretty much anything else? Like, it was formerly outlawed - that is how advantageous it is.
It makes me want to put my head through a wall when I continually see teams running sweeps, other off-tackle plays, handing the ball to a back who is 5-yards deep, etc. on 4th and a freaking foot.