TODAY, RUN FOR 25 MINUTES AT 60% MHR: If you live in an urban environment and are too pressed for time to get to a scenic location for your day's run, you may find yourself circling the block a few dozen times. Although such courses tend to become boring, they are easily measured in terms of both time and distance. Make sure that you run on asphalt and not on hard concrete sidewalks. To minimize knee strain, round corners rather than cutting them sharply.
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