Originally Posted by Zenturtle
I know the unassisted rotation clip and agree with your explanation.
In my view body bending can be used to improve propulsive power, but as far as I know Ti swimming, TI is more about always holding a straight line.
So, when no bending is allowed, to achieve hip drive, you need a kick?
hmmm...this sounds like a trick question. hip drive to me implies rotation coupled with forward movment. To create rotation you need something to provide a "normal force" or some friction perpendicular to the direction of movement. if you have a stiff wooden torso and two stiff legs, one of the two legs needs to move to create that friction in order to produce rotation.