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Can anyone help me with this.
I'm training for the Great Wall half Marathon, I have a month to go and things were going well. About a week and a hlaf ago I did my first 12 miles in 90 minutes, I was really pleased. However, since then whenever I run my legs start to ache after about a mile, to the point where I keep cutting my runs short. This is really frustrating and I'm worried I may have to pull out of the Great Wall. Can anyone explain why this is happening and/or what I can do about it? Thanks