Obviously I'm no doctor. But I would guess and strongly believe that there are a whole lotta people who are on prescription mood altering drugs whose problems could be as aptly dealt with by a weekly walk alone in the forest, or sitting below a waterfall, just thinking. I don't intend to dismiss or minimize mental illness, or to suggest that there is no place for pharmaceutical treatments. Only that our society is quick to seek and offer pharmaceuticals, and I just don't think it's warranted in X% of cases.
When I was 13, a friend suggested Cross Country in High School. I'm 57 now & have worked out (calisthenics, mostly a few light weights) and am still running (down to 3 x a week due to aging knees) - ever since.
Anyone who runs knows it's a sport tailor-made for thinking (meditation in motion). About the only drugs I take is a giant, green, generic nighttime flu pill during the winter months whenever I've been around large crowds of people & where hand-shaking is a necessity.
For many years I paid the price of exercise. Now, still able to wear sports jackets from 30 years ago...I'm enjoying the price. The discipline is transferable to other endeavors (marriage, Bible study, parenting, leading men's groups, etc) e.g. #JustDoIt.
Besides...there's a l-o-n-g list of folks I'd want to kill first...prior to any contemplation of suicide.