I have to admit, working out isn't easy for someone with a limb difference. Half the battle is making sure you're working out your residual limb just the same as your other, otherwise you'll end up with one lopsided-looking arm. Fortunately for me, I've found a couple adaptive solutions to help build muscle in my right arm. I've used this nifty weight-lifting hook ($30 for a pair) to hold some of the weights I use at the gym. Check out the video below to see how I work out my deltoids!
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Weight-lifting hook (Amazon) - $30