Sit upright with a head harness attached to the low pulley of a cable machine. Keep your back straight and shoulders relaxed. Slowly flex your neck forward by bringing your chin toward your chest against the cable resistance, then return to the start with control. Maintain a steady pace and avoid using momentum to ensure the neck muscles are effectively engaged. :contentReference[oaicite:1]{index=1}
Log your cable seated neck flexion (with head harness) sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.