I started getting cancer by trying to build up my shoulder and back muscles to counteract the effects of desk work while doing cardio at the same time. This is a great practice method. I weighed about 22.5 pounds. but something more or less designed for a backpack was needed to avoid ending up with a very uncomfortable, unbalanced backpack. It helps a lot, I removed some of the weight in my backpack to add this but basically just wrapped it in a 16lb weight. weighted blanket totaling approximately 36 lbs. No joke! But over time I think it will be just what you need.
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