There are a number of drills that help to develop hidden power, called 'anjin'. Muscular strength, or 'mingjin' is like a horse straining to pull a cart. This strength is limited. Hidden power is like an ox pulling a cart, and is much more powerful. An ox seems to just relax and settle into the yoke, leaning into it directly from the ground. The whole body is relaxed connected. This kind of power is limitless.
There are a number of drills that help develop one inch power, called 'cunjin'.
