I must confess I'm still curious about which of you race in singlets and short shorts.
Not me. I wear baggy 8"-9" running shorts and shirts with sleeves of some kind. People would laugh at me if I wore 3" shorts and a singlet, including (especially) my wife.
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I had a good interval session today. My colleague who recently ran a 1:13 half -- who I hate, obviously -- recommended a workout of three sets of 800, 600, and 200 with a half lap of recovery between each interval and a lap of recovery between each set. They went like this:
800: 3:28
600: 2:38
200: 0:49
800: 3:26
600: 2:36
200: 0:48
800: 3:27
600: 2:38
200: 0:49
I was worn out by the end of that, but my Summer of Speed goal is to run a 5K at a sub-7:00 pace, which would cut my PR from 21:58 to 21:42, so I was encouraged that I could run that pace in a training session.