[ahimel]

Originally Posted by Lotus

I'm trying to find a good site to explain, but you might be better off to hit a library and look for a real kinesiology text.

I'll give that a shot.

Hrm, I'm doing this motion, and all I'm activating is lower & middle back extensors. I get the feeling that this isn't the group to which you're referring, as these extensors are pretty easy to isolate.

Yeah, see that's the problem. You can't do the exercise correctly unless the muscle is developed, and if the muscle is developed you don't need to do the exercise.

Can you point me at a good series of pics so I can see what it looks like? (I can't really find anything with a quick search, and I hate to start doing an analysis on a moment when I'm not real sure what it looks like.) I'll can see if I can replicate it with some semi-willing victim: my cat or my niece or something.

I'm not sure if I should be party to this but I'll see what I can find. One of the moms probably has a video.

For someone with little med background, I recommend Clemente or Netter. Grey is fair, but the "unrealistic coloring" in Clemente and Netter make it easy to visualise the layers. (Unfortunately, real bodies aren't color-coded.)

A serious design flaw.