I should have known better. I booked a session to use the running track at Bath University yesterday. A lovely morning. A thirty minute walk there to warm up, then a 1km run to warm up a bit more. Then I ran a quick (these things are relative) 400m, reaching my target of going under 1m 30sec. Hubris - I then thought it a good idea to run 100m all out. It had crossed my mind that this might be hazardous (I've seen enough sprinters pull up with muscle strains). Alas, a few strides in and my left thigh was gone. Not sure whether it is a muscle tear or it was cramp but I'm feeling a little sore both physically and mentally this morning. No running for a while. The only compensation was that I had remembered to take my newly issued bus pass with me and use it for the first time to get home.