Stretching is bad for your health

I dabbled with proper mountain running when I lived in Scotland. Ben Nevis, Paps of Jura, Goatfell, Loch Lochy. That sort of thing. One of my strongest memories of this period was the Slioch hill race, a 12-mile dash up and down a Munro and its top. It is brutal: two to three (or four)…