http://www.nytimes.com/2012/02/03/business/army-studies-workout-supplements-after-2-deaths.html?_r=1&

Now I'm willing to bet those soldiers were pushed to an exertion level that the ordinary gym rat would not. But that being said, when I used 1MR and Jack3d, I totally felt a similar effect to how I'd felt when I'd tried meth in my circuit party days.