Sit upright on a bench facing away from a cable machine with a head harness attached to a low pulley. Secure the harness around your head, keep your back straight, and hold the bench for stability. Slowly extend your head backward against the cable resistance, then return to the start with control. Focus on smooth, controlled movement to work the neck muscles effectively without strain. :contentReference[oaicite:1]{index=1}
Log your cable seated neck extension (with head harness) sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.