Good stuff from Coach Hoover’s site:
I first learned this play while studying the Meyer/Mullen Florida Gator Offense. I remember sitting at their first Spring Clinic, listening to Dan Mullen talk. Mullen explained that their offense mainly used five passing concepts: All-Go [Ed.: See also this article.], Smash, Houston (maybe another article in the future), H-Option, and Follow-Pivot.
[Ed. Note: Urban Meyer and Dan Mullen got this play (among others) from Joe Tiller at Purdue. Check out pages 131 to 133 (in PDF page numbers, not playbook page numbers, of the 1999 (Drew Brees) Purdue playbook.]
After studying the Follow-Pivot concept, I realized that it was very similar to the NCAA pass (Post-Dig-Drag). However, because of the distribution of routes, this concept is better suited to beat Quarters coverage. . . .
Conceptually, the play creates a High-Low on the Free Safety, as well as [a] Middle-Triangle [read] off the two weak-side Linebackers (or weak-side and middle LBs). I always put the Post to the boundary, and have the Follow route coming from the field. I do this because teams will almost always rotate their coverage to the field (which would disrupt my Triangle) or because we see a lot of Quarters with the Strong Safety inside my #2 receiver to the field (which makes it difficult for that receiver to run the Post). I must create a situation where I can isolate the Free Safety for my High-Low read, and my Post and Follow routes can win.
The two receivers closest to the ball will run Pivot routes if displaced or Check-down/Breakout routes from the backfield. Their purpose is to attract the two LBs closest to the Post, or replace those LBs if they disappear in coverage or become pass rushers. Those two LBs are also the players that we are trying to occupy get the Follow route open. A coaching point that we teach to the Pivot & Check-down routes is to have them sit and replace the LB they are aiming for if he rushes the QB or drops into coverage. They will only work outside if they are covered, as this will open up a huge throwing lane over the middle for the Follow route. Finally, the outside receiver to the field runs a Curl, and is there should the QB have to scramble that way.