Neck extension — trains the back of the neck, which the book calls the most important neck area to train (aesthetics + protection). Balances the Neck Curl.
Cues
Use a neck harness (best) or lie face-down with the head off the bench holding a plate on the back of the head; push the head back through full range, lower slowly.
Programming
2–3 × 12–20. ⚠️ Be cautious — light warm-ups, never jerk the load. Keeping reps high forever is fine.
How to progress
Reps to ~20 before adding weight, then small load increases. → Progression