Why call it an injury?
There are articles and books that state that exercise, of the 'resistance' or 'anaerobic' rather than aerobic exercise like running, causes injury to the muscles, and then the body repairs the injury, which brings about the desired result of strength and a more muscular physique. (".." what is the word for a guy's build).
--A baby that cannot initially raise her head or crawl. Her first use of muscles might be the ability to raise the head, which any parent raising a newborn knows about... Or learning the first time to crawl. Is someone arguing either the the baby injures her muscles in getting the first muscular ability to raise her head or to start crawling? I don't think so.
--What I think really happens is that when you exercise, let's say an arm for example. If you lift a weight up or down (curl or extension) what really happens is that the movement creates chemical signals that travel throughout the body. You can feel this sensation of the body responding to this type of exercise, it's known to work out/gym 'freaks'. It could even be partly electrical. These are growth hormones that cause many changes in our body. Alternatively, if you INJURE yourself, you cause black and blue marks on your body. Is someone saying that anaerobic training causes black and blue marks? I don't think so...
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