It's Gotta Burn

Just a quick post, but don't let the brevity fool you, this is a good one... Mark Sisson links up a study that suggests it's the workouts that result in lactate production that stimulate a human growth hormone response (cool study, bummer for the folks with McArdle's disease). Art De Vany follows up with more (upon reading you'll probably want to Google his site for "hierarchical sets").