I, Bodybuilder by Christian Thibadeau

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When you lift weights your muscles learn to work better (neural adaptation which I have mentioned lots of times) and you become stronger, however your body recruits less muscle fiber the more it adapts. The less muscle fiber you stimulate the less you grow. Therefore trained olympic lifters can make significant strength gains with little increase in muscle mass.

Higher volume multiple set routines have proved to be more beneficial in terms of production of testosterone and GH and at also creating microtrauma because of the extra time under tension.