On page 17, Figure 2-4B, it shows two pictures at the bottom; with Dennis Rovere, who is leaning his torso forward, and extending his head. I do not do this, nor do I recommend it, since it causes one to be less rooted, and more committed to a forward motion. One who is skilled will see this forward leaning and lead the person with their own energy. This is not in the photos of the old time practitioners.
Leaning forward is a mistake for any reason unless you are a Western Boxer. To lean torso forward to cause a blow to glance is slower than the striking arm or foot. Leaning forces a commitment to forward movement, which can be lead to throw one off balance. It is a basic of all Chinese Internal Martial Arts.
****