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To understand why the Colts are ranked 29th in the league running the ball, you have to understand the basics of run blocking.

When you have a Pro-Bowl running back on your team, and an explosive backup running back as your No. 2, and you can only average around 3.8 yards a carry, then something is wrong with your offensive line.

Before I go any further here is the link to the diagrams that show the different techniques discussed in this article:  Bleacher Report - NFL