[brianmanzella]

Good points, Marty!

Try this experiment:

Have a pal hold your head dead still.

Have another hold a finger BARELY above the base of the 'neck bone.'

Make a backstroke.

What happens?

The 'neck bone' moves WAY forward.

What is that, reverse swaying?

I don't know what it is exactly, but it is NOT rotation about a fixed point...

'cause the point is MOVING.