[09bjb]

You'll keep coming up empty, so to speak, trying to nail down the result of spiritual disciplines into a concrete definition. Science's point of view is verifiability by repeatable, direct observation. With spiritual stuff, the healthy attitude that you'll usually get is, "try it for yourself!" The direct experience of the result usually precludes further need to verify from other perspectives.

All that said, I think understanding the science underlying the remarkable experiences people have during or as a result of "mystic" experiences (for which we have pretty decent scientific definitions; see the Johns Hopkins psychedelics questionnaires) is probably what's holding us back from spreading more and better healing. We're not going to move forward giving everyone the usual "Well, it's definitely weird, but it works, just trust me."

Disclaimer: not a Kundalini practitioner. My healing has mostly been reading-, meditation-, and psychedelic-flavored.