Building up your back is more beneficial than just checking off another box on your full body schedule. Once you get going, your posture will improve, as your weak, once-ignored muscles grow, so your desk-hunch will be less pronounced when you’re away from the office.
Your back can also play a large role in boosting strength for other lifts you might not expect, like the bench press. The muscles in your upper- and mid-back help stabilize your shoulder joints. The stronger and more stable your shoulders, the more weight you can lift in just about every upper-body exercise.
Since many back exercises require you to use your arms for pulls and rows to activate the muscles, working your back is also great for targeting your arm muscles.