For me, it was really about actively surpressing my thoughts because otherwise my mind wouldn't have stopped the chatter. It doesn't happen overnight. The willingness to practise mental Silence without stress or pressure is important. It worked perfectly for me, and once you have postive results you are much more motivated and willing to do it again. I cannot emphasize th power of mental Silence enough. Walking in nature is great or anything else too, but it is really about NOT thinking and not getting distracted by incoming thoughts. :)