Pull-ups/Chin-ups work a lot of your upper back and shoulders along with your arms.
There's a piece of equipment, I think it's called a Roman Chair. It's hard to describe, but you sort of fold yourself over at the waist on it and lift your upper body using your lower back muscles. You can also use it facing sideways to work your obliques (the muscles beside your abs)
Which reminds me, don't neglect your abs. Do some sit-ups/crunches.
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