I have been slowly building up my mileage over the past 3 months from running nine miles a week and not biking at all, to now running fifteen miles a week and biking forty-five. I have built in "cut-back" weeks every fourth week to help me maintain the progress. Each week has had at least one tempo run (usually 3 straight miles around 7:10 a mile) and most of the other miles have all been easy. I have been using a heart rate monitor to help make sure I keep easy days truly easy.
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