I found this great video below of the University of Michigan executing a speed option out of a trips, open (3x1) spread offense formation.
Two things to notice:
1) Watch the offensive line really sell the zone play left on the snap, this freezes the inside backers and gets the front 6 of Iowa moving left.
2) The perimeter (stalk) blocking by Michigan is very good (notice I didn't say 'excellent', or the play would have went for an even longer gain) on this play, I can't stress enough the importance of blocking by your receivers on all run plays out of the spread offense, this is critical for success. It must be worked on in practice just as much as catching the ball.
Keep spreading e'm!
www.SpreadOffense.tv (video sharing platform)