As you add on the pounds, your body is going to scream, but just think of the payoff Arnold described when recalling his first muscle-building success. "Seeing new changes in my body, feeling them, turned me on," he said. "It was the first time I'd ever felt every one of my muscles. It was the first time those sensations had registered in my mind, the first time my mind knew my thighs, calves, and forearms were more than just limbs."
With each added rep and attempt you're pushing one step closer to unearthing your true potential and carving out your goal physique. Just be sure to leave some gas in the tank, because after you complete these, you'll have to continue on to crushing 6 sets of 10 wide-grip pull-ups.