munchanka:

Last night, Paul Mendoza and I spoke to our animation class about the concept of “Simple vs Complex,” and I thought some of you might find this useful. The idea is to balance a strong pose by contrasting simple and contrast forms.  The simple (stretching) side of a pose is usually your main line of action, while the complex (squashing) side is where you get most of the interest and the focal points of the pose. “Simple vs Complex” also works for individual parts like a flexing arm or a hand pose. This concept enhances clarity, appeal, and energy in any pose.

Bruce Timm’s style illustrates this concept best, but great actors (like the Python troupe) display this kind of posing all the time.

Have at it!