The lying tricep extension (AKA Skull Crusher) is one of the best tricep building exercises there is.
- Sit on the end of a flat bench with a barbell on your thighs.
- Grip the barbell with an overhand grip (palms facing down) with your hands about shoulder-width apart.
- Bring the bar up to your chest and lay down on your back. Extend your arms straight up above your chest.
- Keeping your elbows fixed in place and not pointing out, slowly lower the bar until it is about an inch from your forehead (hence the name skullcrusher!).
- Pause, and then slowly extend your arms back to the starting position.
- Do not lock your elbows out, and then repeat for desired reps.