Today's workout is not only designed to hit three body parts—chest, back, and abs—it covers every muscle in those body parts, resulting in a physique that looks great from all angles. For example, while chin-ups and rows are both back exercises, the chin-ups target your middle back, while the bent-over rows hit the lower lats.
Whether your goal is a show-stopping physique or functional strength, it's important to keep this in mind when choosing exercises. No single back exercise will fully work your entire back, just as no one arm exercise will work your entire arm. Fortunately, Arnold knows this, so you're covered!