I have heard that when you start working a new muscle it takes some time before you actually start to build it. First it tones up then starts to build, is there a time frame for this or is this just a myth?
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When you work it it breaks down. It is your nutrition and rest that rebuilds it. It depends on the intensity of your workout to the degree of break down that will give you the rebuild while you rest. Train intense and you eat well= more growth and build.