I just went on a 10 day vipassana meditation retreat -- and I highly recommend it for anybody who wants to jumpstart their practice. That said, it is really hard work and you have to be prepared for a bit of mental and physical pain (no talking allowed, just two meals a day, and a grueling schedule of sitting cross legged for up to 10 hours a day).
I have no doubt the experience will make me a better investor (although that is merely a byproduct - not the goal). I really believe that our biggest enemy as investors is not the Fed, the Chinese economy, Donald Trump or whatever -- it is our own mind. It is our tendency to do dumb things when we are feeling restless, bored or panicky. Meditation helps you slow down and pause before making the kind of knee-jerk decisions that routinely get us in trouble in investing -- and our everyday lives.
Anyway, happy to elaborate if anybody is interested.