Having a strong upper, middle and lower back is very important, as your back       muscles connect most of your other upper body muscle groups together. Along with   being a key contributor to great posture, back muscles help us generate power in     many sports that require a swinging or throwing motion. Because your back muscles are behind you (obviously), they can be tough to see, and at times can be forgotten about when you are looking at yourself in the mirror. Don’t neglect these large muscles, instead keep them top of mind when performing your upper body workouts.