Interesting article about how high intesity training triggers the release of HGH

THREE YEARS AGO, Jeff Mitchell, a 42-year-old business consultant from Jackson, Tennessee, doubled his maximum bench press from 135 to 280 pounds, cut two seconds off his 100-yard-dash time, lost 40 pounds, and shed six inches from his waistline—all in just over a year. His muscles bulged, his skin looked smoother, and he hadn't felt so good since playing college basketball.