After two Saturday 10-mile runs this month, wanted to see if I could speed up a little. Last two were 10:32 min/mile and 10:04 min/mile. Was targeting a 9:45 min/mile (about an hour and thirty eight minutes) today. Due to some incomprehensible enthusiasm, started too fast. Eventually paced it out to finish at 9:14 min/mile (an hour and thirty two minutes). I did have to take two water breaks and allow myself to catch up with my breath. I have no doubt that I am going to pay for this dearly tomorrow. It was an absolutely gorgeous spring day though!!