Walking as described MAY help people to maintain what is called 'good mental health' but I'm confident that this is just 'another way forward' like so many other 'ways forward' and for me its just too simplistic. Although I'm sure all of these projects are done with the best of intentions and that they do help some people, at another level its also just marketing, 'selling' something, an idea, a strategy etc, to the public. Some people may benefit but others will be disappointed, that I'm sure will be the reality. Individual people, the way they grow up, their genetic makeup, their work and life experiences they go through and so on I believe are the nuts and bolts of our lives from birth to death. These complexities I believe are so little understood in the way they personally affect us, much more than most of us would perhaps even dare to admit, even to ourselves. I just cannot see how 'mental health problems' can be pinned down to a few factors, I believe it's far more multi-complex than that. I personally wouldn't in any way decry walking, running and doing sport in general and a lot of other things as well, but I have always accepted in my later years (NB I too am not an expert, I can only write an opinion) that because people are individuals and I actually believe they are, mental health strategies need to be sorted out mostly for individuals!! I've worked with people with 'mental health problems' since the age of 17 and I have had many strategies and cures (ECT for example) thrust at me and have experienced all sorts of 'ideas,' 'beliefs', 'breakthroughs,' 'wonder drugs,' 'using different words to describe the problems' etc, etc, etc, you name it, I sure I've been part of it at some part in my life? 75 years later I can only conclude that 'we' are no further forward than we were 2000 or more years ago. Of course, we have changed the external factors, our attitudes, our caring styles, drugs, various types and forms of help, etc, etc which appear to help some people but it has never seemed to me that we have made any 'real' progress in what actually goes on inside the human body and mind. I can only ramble on and cannot argue my views effectively, I'm just not clever enough or educated enough to do that, I like most people have arrived at a personal view, and that's all I have, a personal view.