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 mil — Kenneth H. Cooper

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 mil — Kenneth H. Cooper

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 mil — Kenneth H. Cooper

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 mil — Kenneth H. Cooper

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 mil — Kenneth H. Cooper

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.

— Kenneth H. Cooper

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