I've done clen numerous times, the past few times ramped up to 120 a day, and to be completely honest I've seen better results with other stuff. All the jitters, shakes (try writing your name when you're on this shit. People look at you funny), and occasional (but pretty bad) headaches you get from clen, just not worth it to me anymore. I'd rather feel jittery on an ephedrine stack and see WAY better results. I only tried cardio once when I was on clen, my first or second run...I kept having to take breaks.