I would have posted this is in fitness but there's not really any point. So I'm enlisting soon and I figured I might as well start strengthening my back as much as I can. I don't have any equipment except push up bars and I don't have any money. I was thinking about putting rice bags in a back pack and walking long distances with it, would that mess up my back?
Suggestions?
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Start with core workouts. Anything to do with your abs, when you work them out, you're using your back too. If you have anything you can lay on with your torso hanging off to do a reverse sit up, which will target your back largely, do that too.