Playbooks

Mtn HB Stretch is an outside zone run out of Shotgun Bunch TE, and the diagram shows pre-snap motion bringing a bunch receiver across to the backside before the snap. The offensive line flows laterally with zone steps toward the play side while the HB takes a wide aiming point to stretch the defense horizontally before deciding to bounce, bang, or bend the run based on flow. This is a pure zone run play designed to outrun pursuit to the edge, and the primary read progression is the frontside double team and playside linebacker fit, reading from the tackle box out to the edge defender to decide the cutback lane.
Watch the motion defender before the snap: if a linebacker or defensive back follows the bunch receiver across the formation, that confirms man coverage and tells you the alley defender is occupied. Key the playside defensive end and outside linebacker leverage, since a hard crash to the edge invites a cutback while a defender staying home forces the HB to bounce it outside. Stacked fronts with extra defensive linemen and disciplined edge setters shut this run down fast because they clog the stretch lanes before blocks develop. Look for safeties cheating down into the box pre-snap, which signals run support and means the cutback lane will be crowded, favoring the outside bounce instead. Post-snap, track the playside linebacker's pursuit angle: if he overruns the play chasing width, the interior cutback lane opens up behind the zone blocking.
Use the pre-snap motion to identify man versus zone coverage since a defender following the motion man across the formation confirms man principles and opens up cutback lanes.
Call this out of Shotgun Bunch TE on early downs like 1st and 10 or 2nd and short to keep defenses honest against the pass-heavy tags in this set like Bunch Levels or Mesh.
Pair this play with Mtn Read Option or Inside Zone in the same set to condition the defense to bite on inside flow, then hit Mtn HB Stretch to attack the edge once linebackers start crashing downhill.
User the playside guard or tackle if you see a linebacker flowing hard to the play side, since winning that block springs the cutback lane for a big gain.
Avoid this call against heavy odd-front looks with extra defensive linemen since gap discipline can cut off the stretch lane before the HB reaches the edge.