Your muscle is made up of fibres: the more fibre there is in the muscle, the bigger the basic size of the muscle. For total exercise of the muscle all the fibres should move, but the system is economical: it will move only as many fibres as it needs for moving.
With the strengthening of your muscles the same work will be done with the help of less fibres, therefore, you need to use different weights and exercises if you want to improve, beautify and strengthen your muscles. For increased muscle, it is not the number of muscle cells that grow but the size of them.
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