well I did it, and kept running for the full 20 mins, although slow, and lots of new muscles protested! And I did it in the rain, hate rain, but it wasn't so bad really. And I'm over the half way mark, which is amazing! But feel deflated - what's that about? I was slow and it was tough, maybe I just got too excited that it was going to be easy. Not used to feeling glum after a run!