Depends on what you mean by existence? Detectable by modern instrumentation? What if Qi is an extremely useful system of mental organization, allowing practitio

Depends on what you mean by existence? Detectable by modern instrumentation? What if Qi is an extremely useful system of mental organization, allowing practitioners to fine-tune their own body's operation. There is plenty of evidence that this is possible (see mindfullness / trancendental meditation) which have concrete isomorphisms (so to speak) to the concept of Qi.