On the recommendation of Charlie Brooker, no less, I downloaded an app that helps you build up to 5k of running in 6 weeks. I thought that as my knee is still very much crocked, this might be the smart way to do things. Unfortunately, I also decided today was the day to try out running on the balls of my feet, and I'm not sure it works. Definitely weird going downhill, my knee feels twingey and unhappy. But then, it did before I went out, so I'm not sure it made any difference. I will persevere.
Still, exercise for today done!