I've recently started running every day to train for a marathon (previously 3 days a week). It feels great and I'm sleeping better than ever. Also, weirdly, I'm

I've recently started running every day to train for a marathon (previously 3 days a week). It feels great and I'm sleeping better than ever. Also, weirdly, I'm less stiff/sore now than when I ran less, likely because I've increased my stretching and bought some extra shoes to rotate between. I'm not sure why running works so well for some people. The article says it's about "claiming time" but that would work equally for most things. My theory is that voluntarily and consistently choosing to do something painful is psychologically healthy. A manageable amount of suffering makes you happier the rest of the time.