Place a flat bench in front of a cable machine with a low pulley and attach a straight bar or rope. Lie on the bench with your head near the pulley and grasp the attachment with both hands. Start with your arms fully extended above your chest. Keeping your upper arms stationary, bend your elbows to lower the attachment toward your forehead. Pause briefly, then extend your arms back to the starting position by contracting your triceps. Focus on controlled movement and keeping tension on the triceps throughout the exercise.
Log your cable lying triceps extension sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.