Chapter 2: The True Drivers vs. The Myths
A great deal of the confusion in hypertrophy training stems from conflating external load with internal stimulus. The real driver of growth is a specific type of mechanical tension experienced at the level of the individual muscle fiber, and understanding how to maximize it requires a firm grasp of the neuro-mechanical partnership between the nervous system and the muscle. This section defines mechanical tension precisely, introduces the non-negotiable role of motor unit recruitment through Henneman’s Size Principle, and explains why the force-velocity curve acts as the ultimate gatekeeper of fiber-level tension. Crucially, it establishes the central thesis of this book: high-threshold motor unit recruitment and high fiber-level mechanical tension are synergistic and equally essential; one without the other is a zero for hypertrophy.