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Program or Application that allows a user to view the physiology of stretched muscles

I apologize if this is offtopic or not straightforward enough as it is my first question on stackexchange. I was wondering if there existed a program/application/website/media that allows for one to ...
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When are the physical benefits of a single workout realized?

When does your body actually build muscle in response to fatigue from a workout? For example, if you slam your arms in one work out ( say any combination of, curls, pullups, pushups, bench press, ...