It started out of curiosity while in my meditation conscious living mood about a year ago, but ended up something I exercise daily since it just feels good to me.
Most notably I noticed that my legs where no more chilly or sweaty with no reason and that my hands are not as cold all the time they where before. As for breathing I noticed that I am much more relaxed on the days I do it then I don't but can't attest to weather this is just some placebo effect or not.
And I notice that I feel much less fly like effects than previous years or if they appear they last no longer than half a day.