Andrew Huberman· PhD
So with strength development, it's a combination of three areas. In fact, all muscle contraction has these same three things. It starts off with some signal, right, from somewhere in the body... From there, some signal has to tell the muscle to contract. Okay. So signal is one. Two it's muscular contraction. And there's a lot of variables inside the muscle tissue itself that determine its functionality... From there, muscle fibers don't cause movements. Muscle fibers simply contract. They're all surrounded with connective tissue. And that's all surrounded with a bunch of more connective tissue. That all surrounds into a muscle. That muscle is then surrounded with more connective tissue. That all comes together into a giant tendon. That tendon attaches to the bone. It's the pulling on those tendon that actually move the bone that cause human movement. So that's area three. Area one, the nervous system, area two, the muscle contraction, area three, some sort of connective tissue thing.