Two runs back to back. First run was 12:31 per mile for 6 miles with an average heart rate of 126bpm. Second run was 9:03 per mile for 7.5 miles with an average heart rate of 160bpm. Besides the faster speed, the second run was much more difficult. Mostly uphill, except for an extremely steep decline at the end where most of my energy seemed to be used for braking so that I wouldn't fall. |