Use heavy negatives on the dip machine for triceps. I absolutely love doing these. It's an effective, safe way to overload your triceps with heavy loads.
Have someone help you do the concentric portion of the lift. Then do the eccentric or negative portion by yourself. Take a few seconds to lower the weight.
Five wins by TKO, four wins by submission, three wins by decision... and a single loss to Matt Hughes by armbar in his first title fight. It's that last one that haunts Spike athlete Georges "Rush" St-Pierre.