7 x 200 m intervals. Hamstring sore and tight, but finally took the Alex approach and figured if I ignored the pain, then the problem really doesn't exist. Pushed to the pain point and just cruised lap after lap, analyzing the structure of the problem. Hurts when the L foot comes down, just before contact with the track. Straight up posture and tight glutes seem to help. So something to work with, even if these 200's were 20 sec slower than a month ago.