What makes muscles grow? – Jeffrey Siegel

What makes muscles grow? – Jeffrey Siegel

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We have over 600 muscles in our bodies that help bind us together, hold us up, and help us move. Your muscles also need your constant attention, because the way you treat them on a daily basis determines whether they will wither or grow. Jeffrey Siegel illustrates how a good mix of sleep, nutrition and exercise keep your muscles as big and strong as possible.

Lesson by Jeffrey Siegel, animation by Brett Underhill.


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  1. It is my understanding, per Jeff Nippard, Greg Nuckols, and others, that muscle growth happens after one adapts to an exercise and muscle damage goes way down. In other words, the microtrauma is encountered on the road to gains, but it is not the cause of gains. Which is why you shouldn't constantly be mixing up your programming. Stick with the thing for several months minimum if you wish to see improvement. This is also why you should never equate DOMS with gains, and soreness should never be the goal.

    And you probably aren't eating enough. And, as Rip says, sleep is the most anabolic substance there is (which seems like hyperbole but makes the point).

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