Ok, I've never heard of this before..But nowthat you mention it, I do the tredmil for 10mins, Just as a warmup type thing because then I go and do tae bo...I wasn't getting to bad of cramps, but my legs were like tightening up and I had no energy..and my knees were a lil wack..lol is that the same thing as ur talking about?

I thought that was just from not doing it in a while, cause I have energy..um..