Weight Lifting Is a Waste of Time : So Is Cardio, and There’s a Better Way to Have the Body You Want

by John Jaquish

That’s because these workouts have conflicting goals. When you do endurance activities, you’re upregulating cortisol, which keeps fat on the body and breaks down muscular tissue. When you do strength training, you’re downregulating cortisol and upregulating growth hormone, which promotes body fat loss and protects lean tissue.