For example , if you 're running 50 miles per week , you only need to cut out 7 miles from your weekly running routine .
It 's actually not too difficult to reduce your mileage by 15 % .
If you 're running 50 miles per week , you only need to cut out 7 miles from your weekly running routine .
It 's actually not too difficult to reduce your mileage by 15 % .