Will Shakespeare once wrote “Remember, thou art mortal”. Our bodies have a tremendous ability to heal, but it is not unlimited. If you run the MCM, and things go south, you will probably not return to where you were before the race. Do you want to risk a permanant limp for one more finishers medal? Sounds like your life is pretty good right now…if I were you, I’d buy a SwiMP3 player and hit the pool, or the eliptical, or the Mt bike, etc. It sucks getting old, but it beats the alternative. Best.