The motion of the legs is often described in very broad terms with terms like 'slide' or 'turn'. Given the affect the lower half pivot has on the motion of the club, it is worth understanding what an optimal movement looks like.
David Griffiths has very long legs and could end up looking extremely clumsy but in fact; he exemplifies a powerful pivot.
Linear vs Rotation
In the subscription part of the site, I cover the topic in more detail and discuss the merits of rotation vs sliding laterally. In basic terms, a slide of the pelvis in transition will encourage a steep shaft angle and 'pivot stall/club flip' action through impact. Conversely, pelvis rotation will more naturally lead to the arms moving outward and the shaft shallowing through the downswing, thus enabling the continued pivot through the ball and all the benefits that brings.
In transition, David squats down rotates both hips externally while the pressure...