I've run over 100 miles. If you had told me 5 years ago that I would be running 100 miles in 3 months, I would have told you you were crazy. It is amazing what you can do when you do a little every day. Of course it helps to be too stubborn or stupid to quit. Maybe I'm an old fool, but at least I'm an old fool who has run 100 miles ;-) 

Not a good day on call when I've been to the hospital 3 times before the sun sets. Trying to hydrate all week long before Saturday's test. Interviewing job candidates on Thursday. Why am I always looking for staff???