One of my running colleagues tripped over his feet whilst out running a few weeks back. It took his wife some persuading for him to go to the hospital for x-rays and he came home with a cast - fracture of the lower humerus (just above the elbow). He stopped running for a couple of days, then started 'just a little run' again - he's training for and planning to do the Abingdon marathon, so if you see the bloke in a cast, it will be John.