Dumbbell Skull Crusher
Sets: 4, Reps: 8, Rest: 30 Seconds
Hold a dumbbell in each hand and lie back on a bench with arms straight overhead and palms facing each other. Bend your elbows so that the dumbbells go behind the head and touch the bench (A). Extend your elbows to raise the weights back up (B). Reverse the motion to return to the starting position. That’s one rep.