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Chin up bars may seem old fashioned and low tech, but they will still give you a great upper back workout. You can work all the muscles of your upper back, incuding latissimus dorsi (lats), rhomboids, and trapezius (traps), with just the chin up exercise. In addition, you work your arms. Use an underhand grip to emphasize biceps and an overhand grip(sometimes called pullups) for other elbow flexors and forearm muscles.