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I decided to improve me 10K PB (46.10) so I started doing speedtraining about 6 weeks ago. I aim 4 X 1500 in 6.45 each. But somehow I cannot manage to pace myself properly. The usual pattern is the following:
I do the first 1500 m in 6.35 so I decide to slow down
Second 1500 m in 6.35 again, which hurts and I REALLY decide to slow down
Third 1500 m - hurts a lot, I feel that I am slowing down but when I check the time at the end: 6.25
Last 1500 m - I can hardly go, I want to stop, I think I will die so I slow down. My time: 6.30
As you see, I want to go slower, I think I am going slower, it REALLY hurts, yet I am getting faster. After each speed training session I decide that next time I will do it slower, yet I cannot make it. I would rather run 5 x 1500 m in 6.45 than 4 x 1500 in 6.35 but after the 4th rep I cannot even stand let alone do another 1500m.
I don't know how to pace myself. Am I doing something wrong? Am I going to do more harm than good if I carry on running to complete exhaustion.
Sorry for being long winded, but I would really appreciate some help.