The one statement quoted from Zig who runs the biomechanic lab, go figure-LOL, was A+++++++.
Hitting Against Solid Front Side
Quote from Zig>
"The forward swing is then initiated at the ground with the application of force to the back foot. As force is applied to the back foot, it creates a linear shift of weight, at the same time, their is a release of rotational energy around (rotating) from the front foot up to the hip of the front leg (the heal which has dropped during linear rotational shift, to provide a solid front side to hit against".
Very advanced indeed, Tom.
Shep's Listening
