Sprinting, or doing high-intensity bursts of exercise with rest in between, does the exact opposite of prolonged cardio. Instead of keeping fat on the body by stimulating cortisol, this type of exercise optimizes hormone release by upregulating growth hormone. Clearly, if your desire is to be a champion distance runner, you don’t want to carry a lot of muscle because it will slow you down. But if you want to lose fat and build muscle, high-intensity exercise is the way to go.
