The case of having two or multiple centers of gravity at the same time, causing the body to lose balance. It is an ill in Taijiquan. To avoid the state of Double Heavy, one needs to learn to separate yin from yang.
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Extension: Stretching of a part or point to make it longer. The original point/position must be maintained.
peng jin：The movement away from the center in all directions. The center must be maintained to be considered an expansion.
- Sinking
- With the baihui point fixed, the movement downward of all or some other parts of the body.
- Any part of the body can be split into yin and yang. When one part is fixed and the other part goes away from the fixed part, it is also called sinking. Therefore, sinking does not have to have a downwards direction.
Momentum： inertia of force. In taijiquan practice, momentum force simply means movement that cannot be stopped.
Powering Up： To increase size, length or compression within a fixed area.
- Split: The action of two (or more) parts of the body moving away from each other. The key is that there must be a fixed spot (does not mean a real physical spot) in this action. This fixed point is also the center of the action.
