The world of traditional martial arts is rife with talk of mystical energies, spiritual powers and esoteric forces.
This video from Tony Blauer on the CrossFit site gives a nice demonstration that physics and biomechanics are all that you need to be an effective fighter.

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Many martial artists believe in the concept of a universal energy force called ki in Japanese and qi or chi in Chinese.
Some do not.
A Kiai Master offers a 5000 dollar challenge that he can beat any MMA fighter:

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