Peng Energy as Swiss Ball in Pool

Sifu Ken Gullette gives an explanation of Peng Energy, one of the most important skills in the internal arts of T'ai Chi, Hsing-I and Bagua. Combined with the ground path, it is essential to maintain Peng at all times and throughout every movement. Sometimes, Peng Jin is called "Ward Off," but that is too simple.

I like the Swiss Ball in the pool analogy, as our body has to have an unshakable resilience or bounciness in self defense.  You root yourself, but your root is alive and agile, not stationary or stiff, and the Peng energy you release comes from your root and is directed from the waist.