why is failure important to hypertrophy?

Reaching (or getting very close to) failure matters for hypertrophy because it ensures you’re recruiting and fatiguing the high-threshold muscle fiber, the ones with the greatest growth potential. Early in a set, your body uses the easier, low-threshold fibers. As the set gets harder, your nervous system is forced to bring in the bigger, stronger fibers to keep the weight moving. If you stop too early, you never fully tap into those fibers, and the growth stimulus stays weak. Training to failure or within a rep or two of it creates enough mechanical tension, fatigue, and muscle fiber recruitment to trigger adaptation. In short, hypertrophy isn’t about doing a set; it’s about pushing it far enough that your body has no choice but to grow.

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