I used to have the same problems that many of you are describing....if you're on clen. that's probably your problem. If you're not, then you probably need to stretch, take more pottasium, drink more water, and believe it or not, you might even need to get some more sodium, because you need to hold some water in your muscles. It may even be a combonation of all these. As far as stretching your abs, lay down on your stomach with your hands out in front of you, then start walking your hands toward your body, arching your back at the same time, keep walking untill you feel your abs stretching.