Given that figuratively all the causes of death in the Western World are directly caused (strokes) or heavily correlated (depression) with a sedentary life style, I am quite sure that regular hiking will massively improve life length and quality.

I sometimes wonder what the world would look like if people cared about the things that actually kill. Like, what if we would invest 300 trillion dollars into fighting prostate cancer instead of "terrorists"? What if we would design an entire education system around healthy sport instead of the prevention of "stranger danger"?