I decided today to take it easy at parkrun and would follow the 35 minute pacer. After my difficult run on Thursday, I found today to be quite easy Strange thing was that while pacing alongside the pacer, I was able to hold a reasonable conversation with him as we went along -- not exactly a flowing conversation, a bit stilited but good enough to be able to discuss a few things --BUT my HRM showed that my average HR for the 5K was 90% of max ( max showing as 163) . I have been doing some runs at low HR's -75-80% of max and would not have expected to be able to hold any conversation at all at 90% -- but I did!! I was also a bit surprised that my av HR went that high for that relatively leisurely 35 minute pace - as my PB is just a tad over 30 mins.
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