I just finished a 10.007km run that lasted about 0hh:50mm:47ss !
I felt good during the run but strangely my heart rate was a bit high for this pace. Usually I can do the same and be under 150 bpm and today I was at 155 on average.
Also, I try to increase my spm. I ran with music today (at 180 bpm) to help but my earphones died after 3.5 km. I will have to try another time.
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