I think i remember from a Paul Chek seminar that you should unlock your knees to about 15 degrees when doing stiff legged deadlifts. Something to do with the IT Band sliding off the knee? If there are any Chek practitioners out there please confirm or deny this! He also said that performing SLDL...
If we are talking about the rectus abdominus- think of ab muscles like a section of bubble wrap. Two bubbles across by three bubbles down. There can be lots of air in the bubbles or very little air, equating to well developed abs (bigger) or under-developed abs (smaller). What you cannot do is...
Well said! Would'nt it be nice to "carve in detail" just by doing certain exercises! Bring out some cuts by chosing a different exercise. Get some striations by doing that magical exercise. If only! Then we would not have to watch our diet and bf %! Excellent.