Hard qigong is a foreign skill, which is characterized by one year's success, two years' disability, strong external skills and premature aging.
Slap: It will cause subcutaneous congestion, which is toxic for a long time. The impact of flapping will persecute the heart, which is not conducive to longevity.
Internal strength: rosy complexion, soft as cotton, hard as iron, infinite strength, enhancing immunity and prolonging life.
Hard qigong, external force, are not strong.
The ubiquitous internal strength is the most powerful.