Being in a weird/unnatural position for a long time can put unhealthy strain on your muscles, unlike when you use good form to intentionally work out those muscles. And when you have bad posture, a lot of your weight is put on types of muscle and supportive tissue that aren’t the core muscle you generally think of when it comes to strength. So extra strain where it shouldn’t be, and less use of the muscles you should be using. It’s advised to strengthen those muscles so that they can more easily support good posture, keep your bones aligned where they should be, and reduce long-term strain especially on other tissues.
(I’m not a fitness/physiology expert tho, so feel free to correct me folks)
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