I want to preface this review with the fact that I've tried other synthetic nonsense on the market such as NO Xplode and Jack3D, SuperPump, etc. They have a very unnatural feel to them, you get beyond jittery and restless after the workouts, hence their "take 4-6 prior to bedtime" direction...NOT the case with PHISM. It provides you with a great 2nd, 3rd, 10th wind without an overstimulating effect. I've taken it with a shot of espresso before grueling Brazilian jiu jitsu training sessions, 2-3 hours and felt great energy and endurance. Also have taken it during strength and conditioning routines with the same positive results! I cannot speak for leisure work outs of a few bicep curls but I am sure it helps you fight fatigue in those cases as well but if you're a serious, hardworking athlete than there's nothing else out there I'd recommend! Don't let the "big names" fool you, this stuff is top notch, so get some and see the difference for yourself!