Ha difference in the two techniques, exercise is what?

I have heard that lifting weights with a small number. reps increase muscle definition and shape; The heavy weight and less reps build muscle density and muscle building. I also heard that they do the same thing. To where and if they are original. What is more effective?

They are the main types. muscle fibers. work hard weight. "Slow twitch fibers" to which the strength and size. Weight many reps "fast twitch". fibers that contribute to speed and endurance.

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