Playing around with a Tai Chi version of Bruce Lee's "one inch" punch. More like three or six inches if I'm being honest. This isn't really something that we train per se, but is a result of the training. In Taijiquan the power is generated through relaxation not direct muscular force.
Here I am shifting my weight from the front to the back and directing that force into the bag, which is filled with 100lbs of water.