Reverse-Grip Skull Crusher (Barbell)
Also called Reverse-Grip Lying Triceps Extension (Barbell)
How to do it
Lie on a bench holding a barbell over your chest with a narrow supinated, palms-up grip. Keep your upper arms fixed as you bend your elbows to lower the bar toward your forehead, then extend to full lockout. Control the return and keep your wrists straight and elbows from flaring.