Well I've been saying I should start running and I guess that was a start. Of sorts. I got about 2km through the 3½km I'd set for myself as a walk/run circuit when muscles in my thighs which I apparently don't use much for cycling got the the stage where it was clear that if I eased off, they'd be a bit sore tomorrow and then bounce back better than ever but if I persisted I'd likely regret it. Oh well. More of this and I'll go further and faster. I believe that's how this works.