A few weeks ago, I started the 5K Training app by the people behind Zombies, Run! I kept it going for about two weeks, and then stopped for no reason.
Today I got back out there, and have started the training from scratch. I managed around 4.5km, although most of that is walking at the moment. By the end, the soles of my feet was sore, the back of my left leg was slightly painful, and my feet had gone numb. I know the last one is not meant to happen, so I am going to monitor it and see whether it persists or not.