The Sprint Draw has been a hot topic in the coaching community. It was a great play for us and was set up nicely by the amount of sprint out we ran, and the fear our QB as a run threat put into the defense. This was a beautiful constraint play for us.
We got a lot of movement in most cases from the playside DE trying to fight reach blocks, and more importantly we made LBs move, in some clips they SPRINT out of the box to try to get under routes and by the time they realize the RB has the ball it is too late.
OL wise we work to our sprint side and pick up "our man" based upon our pass pro rules and how we ID the front (we use a typical air raid pass pro based on the Center IDing the front each play).
I LOVE this play... there are a lot of times we do not even block it great up front, you will see 1 or 2 guys getting killed, but as long as they remain engaged, the flow gives the RBs enough room to do their thing and be the great athletes they are.