Neil, I walk fast for 1/2 or 1 mile and then run for 3 or 3 and 1/2 miles. Beginner runners are actually harder on their shoes because we have more "pavement time". I have been told shoe replacement at 400-500 mile mark. When you feel it in your joints it's time to buy new ones. Java (Runner Girl) PMed me really great advice as well if I still have the message I will forward it to you. She trained and just finished a half marathon. Granted she is in her 20's and I am almost 40.
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Sometimes I wonder...."Why is that frisbee getting bigger?"...and then it hits me.
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