There's been some spirited discussion in Systema: "Beyond the physical" force generation about "relaxed energy generation" and what parts of the system consider "non-physical" (presumably metaphysical or paraphysical) aspects of it. Most of the answers basically boil down to disparaging the presence of anything past physical mechanics and trickery and there's been a request to remove the two paragraphs where the querent indicates that they are indeed looking for a more mystical answer, and why, on account of them not helping the question.
I think that those paragraphs could be made more clear, but I also think that many martial arts do include some degree of metaphysicality, whether it's a belief in qi, concepts of meditation or enlightenment, or even explicit religious aspects, and I think that that should be on-topic as it relates to a given martial art.
While I don't really believe in qi myself, I feel that the general tenor of the answers is needlessly confrontational, equivalent to responding to a question on Christianity SE about the handling of transubstantiated host with a paragraph about how no one could really believe that the bread and wine are turned to flesh and blood in any sense.