What happens when you run into a wall

I'm not being metaphorical, for once. On Saturday I went out for a run [stop laughing at the back]. It started raining one minute later, but I pressed on despite lacking a hat or anything to keep the precipitation off my glasses.

Soon it was lashing down but I stubbornly kept going. Then a shoelace came undone. And while I was lacking down at that, struggling to see through the rain and my fogged-up glasses, I ran into a wall.

A low retaining wall, but solid brick nonetheless. Stupidly I kept going, blood streaming down my arm. Two days on, it doesn't look too bad.

Proof that exercise can be bad for you!