When your muscles are burning, what you’re feeling is a buildup of lactic acid, which continues to accumulate as you contract your muscles again and again. While lactic acid triggers what’s known as the “anabolic cascade,” which is a cocktail of growth-inducing hormones, repeatedly elevating lactic acid levels higher and higher doesn’t mean you build more and more muscle over time. Thus, for yet another reason, when guys spend a couple of hours in the gym pounding away with drop sets, burnout sets, supersets, and so forth, they’re working very hard for little payoff. If pump and burn don’t
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