Why is it that elevating your heart rat via exercise is good, but elevating it via stimulants (caffeine, clen, ephedrine, etc...) is bad?


Does anybody have some decent articles/studies on this? Or even some actual knowledge on it? I'll take your word for it.


Just tell me dammit. I hate cardio, but love ******** and caffeine. Make me feel better about my habits so I can justify them to myself.


Thanks.