Do you feel sore, tired, irritable or weak? Have you noticed that your gains have plateaued? These could be signs that your cortisol levels are out of whack.

Cortisol is a stress hormone that's truly the antithesis of testosterone: whereas testosterone supports muscle building, excess cortisol kills it. Besides tearing down muscle tissue and preventing the body from storing carbs as muscle glycogen, cortisol actually lowers testosterone. It also interferes with testosterone's ability to bind to its receptors within muscle cells and induce an anabolic effect. When ...

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