Yep he moves his left knee towards the target and the hips to start, but I know what he is saying. I try to have the same feeling because my hips and legs fire too early and I have to much hip slide generally. There is a well known Milwaukee area instructor Manuel De La Torre that is famous for a similar rope drill I believe. Might be the feeling he is talking about. This is from his website.
The de la Torre system emphasizes a true swinging motion, devoid of energy-robbing
leverage. The body plays a passive role, moving in direct response to the movement
of the club.
Understand these swing principles and improve your game:
- If the club is used properly, the body movements take care of themselves
- Within a given arc, a swinging motion produces the greatest amount of speed
- The acceleration and deceleration rates of the swing are identical and
Example of Rope Drill:
I have not tried this, and don't really know much about it, but this came to mind and thought I would share.