Because of the mistaken belief that doing something 'productive' is better than doing something you enjoy. Somewhere along the line lots of people decided that

Because of the mistaken belief that doing something 'productive' is better than doing something you enjoy. Somewhere along the line lots of people decided that if they aren't running everyone else is running past them. The runners then posted endless blog posts about how they are faster runners and run for longer and it became it's old vicious circle. I opted out, Yesterday I spent two hours sat watching a working harbour (with the odd walk to get a coffee) - the boats coming and going, the change on the surface of the water as clouds floated past, the gulls swooping around and it was amazing - after that I spent a couple of hours riding around aimlessly on a motorcycle visiting villages I'd only seen as a name on a map before and running across interesting old buildings/memorials (socially distancing) and then headed home as the sun set. It was the closest I've felt to at peace in the last six months, nowhere to go, nothing that needed to be done. You don't have to be on a treadmill all your life, running without a destination is just running.