I think pull-ups are one of the most important exercises in fitness today. There are few better tests of strength than your ability to pull yourself up. It's a great metaphor for training in general. When the time comes, can you move upward?
You thought triple dropsets were tough, but today's quadruple dropsets just make this back workout much harder! Simply put, for each set you perform 6 reps of a heavy weight, then immediately lower the weight for 8 reps, then lower it again for 10 reps, and finish with one more drop for 12 reps. So, each set is 36 total reps of decreasing weight.
These sets will test your endurance, strength, and mental stamina. Get ready!