It’s not new age at all...and is becoming main stream because it is so effective that it is saving troopers from ptsd where they simply could not be helped before.
I just said it “sounds” like some New Age fad. I agree with you that there is something to it. My own life experience bears out that if you focus on positive attitude and filter out negativity, your overall health (mental and physical) improves. Wish I knew all this when I was younger!