What are the problems that can be caused by undeveloped chest

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Supposedly, overtraining pectoral muscles and undertraining back muscles can result in the shoulders resting more forward than they should be. Is this true and how does it work? Is there an effective

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Is it possible to have a strong chest and weak triceps? - Quora

What are the problems that can be caused by undeveloped chest muscles? - Quora

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I've been going to the gym a lot but I haven't gotten any muscle growth, am I supposed to be taking steroids or something? - Quora

Why does almost everyone say that actors take steroids to build muscle? I mean they have professional trainers, nutritionists and work out several hours a day. Is it not possible to build