The feeling is far from pleasant, in fact, it's one of those sensations that makes you want to give up everything. You know that moment when the effort kicks in and your legs start to burn until you lose strength and coordination? Well, either things go great and you hold on, or everything comes to a halt... even though the intensity of the effort is exactly what you should be maintaining at peak level. There's a culprit, and it's called Lactic Acid.

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