Helping the runner

[don't move]

I agree with Andrew. The only time I have called that penalty in my 36 years was when a guard got in front of his ball-carrying team mate, lifted him by his armpits and pulled him about 4 yards. Easy call. Backs leaning on the ball carrier from the back may technically be helping the runner, but unless you KNOW it actually helped him and that he would not have gained the yardage he did were it not for the push, I say let it go.