To properly grow your muscles you don’t only need to strain them, you also need to have proper diet, good sleep schedule and most importantly rest. It’s why personal trainers suggest spacing out your workouts, never the same muscles in two consecutive days, to give them ample time to repair the damage and make them stronger.
Back hurt is typically caused by people sitting in a chair every day for too long. It doesn’t give time for the back muscles to rest and properly heal and grow.
>If exercising means you strain muscles to grow them
It doesn’t mean that. Straining is putting too much exertion on your muscle to where it tears or pulls beyond what it’s supposed to. When you exercise a muscle, you’re only doing micro tears to it, which build back bigger and stronger. When you strain a muscle, that tearing is way beyond what you might do while exercising.
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