Does anyone use jumping rope as their primary means of cardio conditioning? I bought one a few weeks ago and started using it, most often on days that I'm not lifting. I'm trying to not do so much cardio, because currently I'm tryig to gain some muscle mass. Anyway, I was looking over at www.rossboxing.com and came across this. Jeez! It made me feel like I was on the playground! Of course, even after about a minute I'm breathing a little heavy. His advice was for 6 X 3 minute rounds. What does anyone here who does use the rope do for a workout?