I haven’t really done much exercise for a while.  Yesterday I was in the hills but then had to leave early.  So when it came to leaving and catching an appointment I left myself plenty of time to get there.  So I could have walked down through the forest paths but I ran anyway.  Just for the hell of it.  The terrain at one point was quite rocky and with little patches of ice.  So inevitably I had to slip at some point.  I scuffed my knee and the granite tore a hole in my trousers, and a smaller hole in the knee itself.  Later that evening my knee began to hurt, then hurt more, then it really hurt.  But it was strange, the strange bit being that it lasted 10minutes then simply disappeared. It is a little bruised but feels fine. And tonight I did lots of running with not even a hint of pain in the old knee.  How bizarre.