Colorado State Offensive Line Coach Billy Best takes you through some of their Gap Scheme drills for their offensive linemen. His entire presentation is available on Glazier Drive at O-Line Gap Scheme Individual Techniques for All Levels.
In the video below, you will see practice film and game application footage of his:
Hip Activation Drills: Strain and Climber
Foot Fire Technique Drills : Center Back Block and PST VS 2 Look
Near Foot Technique and finally Down Blocks Drills
Coach Best always starts his drills with the lineman's feet on fire-never from a static position.
For the near foot technique, near foot in the ground and near shoulder making contact on a combination block, then come off and look for the linebacker.
The way they teach down blocks is for the lineman to put his helmet in the V of the defender's neck and drive.