I really don't like the sound of those temperatures! I thought it was cold enough here during the week, but I suppose ti depends what you're used to.
Lisa, it's surprising how quickly you can build up. It's not quick quick, but a couple of years ago I remember celebrating the first time I ran 5k and feeling like it was a huge achievement. Which it was, of course, but I'd never have dreamed what else I'd end up doing.

