Mastering the mechanical principles is far more important than practising technique. But one can lead to the other.
Peng and Lu (aka bump and roll-back) are two well-known tai chi techniques. But they are best used as archetypal representatives of a mechanical principle. Peng is the centripetal tensile geodesic, while Lu is the low shear modulus that must accompany it in order for peng to be effective.
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