Triceps, all three heads with emphasis on long and lateral heads.
Best In Workout:
This three-in-one move is so brutal that it is best to put it early in your routine. Follow this move with reverse-grip pressdowns to exhaust the medial head.
Sets & Reps:
Perform 3 sets with 10-15 reps.
At The Start:
Lie down on a bench with your head at the very edge and have a partner hand you a loaded barbell. If you do not have a partner, you can place the loaded bar at the edge of the bench, then lie down and grasp it.
Wrap Those Thumbs:
Hold the bar with an overhand grip, slightly inside your shoulders. Wrap your thumbs around the bar for safety. Because you are bringing the bar over the face, it is imperative that you completely wrap your thumbs around the bar. Your hands will sweat, and you do not want to drop the bar at any point during the move.
First, The Skull:
The first part of the move calls for a traditional skullcrusher, in which you bring the bar to your forehead, stopping an inch or so away from your head before pressing it back up to full-arm extension. You can also do a modified skull in which your upper arms remain at a 45 degree angle to the floor, but it is your preference. The 45 degree skull will not affect the other portions of the move.
After The Skull:
Lower the bar down toward the top of your head and all the way down to the floor. On the way down, the bar should just miss the top of your head/bench. You basically want to think about reaching the point where the floor meets the leg of the bench.
After a good stretch, keep your arms bent and pull the bar directly over your face to your lower chest. To keep the bar an inch or so above your face as you move it to your lower chest takes incredible triceps strength. From your lower pecs, press the bar straight up as you would during a close-grip bench press. Squeeze the triceps hard and go right into the skullcrusher and the sequence continues. All three moves constitute a single rep.