i can't speak for Mark but I can recall many times - spent a week in hospital after falling off wall, slipped on ice ht head, playing rugby (several), crashed cars. blown across the room in gas blast. The odd bit of fisticuffs . There are probably many more by the time I was leaving my teens

Whilst none of them were particularly major its the cumulative effect that can do the damage. And of course the older you are the longer you take to heal.

I have been 11 months now, although I am a long way off from where I want to be, I feel the corner has been turned to recovery -