The Heavy Formation brings the Backside Tackle over to the formation side, and puts the Backside Receiver where the Backside Tackle was.
Zone Option is utilized when the defense forces a give to the B-Back on Triple.
When this happens, the offense makes the defense defend the Quarterback and the Backside A-Back.
The Heavy Tackle blocks down while the Offensive Line and the perimeter does exactly what they do on Triple Option. The B-Back becomes the extra blocker because of the numbers advantage while the Quarterback takes the snap, opens at 90 degrees, turns off the Receiver’s block and scores unless #2 can tackle him–if so, he sets his feet and parallel flicks the ball to the Backside A-Back.
Utilize Heavy Zone Option when the defense forces the B-Back give on Triple. Make the defense play the Quarterback when they don’t want to do so.