3. Lose fat, not muscle
High-intensity interval training gives a natural boost to human growth hormone production, which is essential for optimal health, strength, and vigor, and has been shown to significantly improve insulin sensitivity and boost fat loss, and increase muscle growth.
Studies have shown that in the 24 hours after a HIIT workout, the body produces 450% more HGH, encouraging your body to build and preserve lean muscle mass while still ridding the body of excess fat.
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