was using Musclepharm Shred Matrix for a while...good stuff, lots of pills tho
Then found Primatene (Ephedrine) at Walmart and scooped a box up, running the ECA stack and have been seeing great results. Forgot how good or potent this stuff is.
Like Block said, I too use it in the morn 15-20 mins before stepping on the treadmill for a 30-45 minute session........