I used to LOVE ephedra based stims (I was a Ripped Fuel JUNKIE), however I could NEVER use during my cardio days. I recall going for a run and having to stop after no more than a mile..heart racing, light headed...I was all f-cked up.
How does RPM compare? Also, I stopped with stims after the ephedra ban because whatever they used to replace ephedra made me all jittery and cranky.
Thanks in advance!