Playbooks

HB Power O out of the I Form Close Flex set is a gap scheme run play built to overload the play side with a lead blocker and a pulling guard. The diagram shows the fullback leading through the hole while the frontside guard pulls to kick out the edge defender, creating a double team at the point of attack and a lane for the HB to press downhill. This is a run play, not a pass concept, so there is no man or zone beater route tree to read: the primary progression is a pre-snap look at the box count and defensive front, then a post-snap decision to press the called hole or bounce off the fullback's block based on how the linebackers flow.
Watch for a stacked box with linebackers creeping to the line pre-snap, since that signals a run blitz designed to beat gap schemes like this one. If the defense shows a 4-3 under front with the strong safety rotated down, the play side gets outnumbered and this run gets shut down quickly. Key the play side defensive end and outside linebacker post-snap, if they crash inside hard the pulling guard can still seal them for a cutback lane. User the middle linebacker to fill the A-gap immediately, since a fast-flowing Mike linebacker is the biggest threat to blow this play up before the fullback gets to his block. Base 4-3 and 3-4 fronts without extra run support in the box are where this concept consistently gains positive yardage.
Check the box count before the snap and only call this into 6 or fewer defenders in the box to avoid a numbers disadvantage.
Use the fullback lead block as your visual key, press the hole hard and trust the pulling guard to seal the edge defender.
Pair this with HB Iso and Stretch from the same set so defenders cannot sit on one gap, forcing linebackers to respect multiple run fits.
Run this on early downs (1st and 10 or 2nd and short) to stay ahead of the sticks and keep play-action off PA Power O credible later in the series.
Against aggressive fronts that crash hard, user the fullback to adjust his aiming point and cut back away from the overload side.