Erick Mead wrote:
"Springs," yes I know. The "springs" in the legs aren't. Muscles only pull in tension, they cannot push in compression. What they pull on is a bone the other side of a joint. They create leverage across the fulcrum of the joint to ROTATE the joint to produce the leverage moment (push) delivered by the limb.
So riddle me this -- rotate or push -- which one is the primary action and which one the secondary??
Riddle me this.... regardless of the simple lever classes, depending on muscle-bone attachments, we could be silly and argue about whether "push" and "pull" have rotational components all day. But why would we take some fairly obvious movement and obscure it from the lay public by splitting hairs over simple "push" and "pull"???? You're the one saying that you're trying to put things into western terms, but if you're going to analyse all pushes and pulls for their rotational components, you and David Skaggs will have to do it alone. Why would anyone else want to join in such a needless exercise?
Besides.... you're still missing the simple point.