[BerntR]

All I am saying is why can't the fulcrum be the hands and the force be the shoulders or the pivot?

You can probably get close with a combination of reverse pivot and a flip release.

With form III you get help fro CF to keep the lever straight. That is a precondition for transmission of energy from the force to the moving mass. With form I the hinge will prevent proper transmission of force to the other side of the fulcrum.