How football play calls are built: personnel, formation, motion, protection, concept and tags. Word and descriptive systems, and how to install your own terms.
A coach's sequence for teaching quarterbacks to read coverage: shells, then leverage, then concepts, from the classroom to walkthroughs, with cut-ups and quizzes.
Reading It Is the Hard Part
Knowing what a coverage looks like on paper is step one. Crucible puts you at quarterback against it, rep after rep, until the read is automatic.