Most people want tangible proof. You cannot blame anyone for wanting proof. We live in a world of charlatans who take advantage of others for money, status and fame.
Almost all of the effects attributed to Qi may be explained using already known and understood physiological processes.
I personally take an agnostic perspective, I accept the possibility of its existence, but so far the evidence is very under-whelming in its support and as I have stated numerous times already, its effects do not come anywhere near the advantages gained using other systems of training.
Qigong is good for health, but it is not the only method that provides the same effects. it may or may not help with spiritual development, but it is not the only method that provides the same effects.
Qigong is extremely under-whelming when it comes to develping the ability to be an exceptional fighter. This is very well demonstrated any time one watches a good MMA fight, fencing bout, boxing match, or any of the various forms of wrestling around the world. You NEVER see any qigong user, much less master, succeed in any of these competitions. Even if one or two did, it would still be ONLY one or two in all the history of fighting. The only thing qigong practitioners have to back them up is imaginary legends and this is NOT proof since the legendary feats have not been repeated in modern times!
This is why qigong is laughed at! It makes wild claims that cannot be substantiated in the REAL world. This gives strong evidence that its practitioners are living in the land of make believe.
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