“You have to run 75 to 100 miles a week if you expect to break the four-minute mile.”
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So I've broadened the fitness concept to make it one of moderation and balance.
Kenneth H. Cooper 
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Now I say that if you run more than 15 miles a week, it's for something other than aerobic fitness. Once you pass 15 miles, you do not see much further improvement.
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After 26 years, I am still practicing what I preach.
Kenneth H. Cooper
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