In today's 5-mile outing I ran 3.1 miles in intervals. Interestingly, I cut short the next-to-last interval because my heart rate seemed too high. It got up to 165, and as I've mentioned before, that's above the max heart rate if you use the normal calculation. At the very least it was in the 90%+ range. It got up to the same rate toward the end of my final half-mile interval, but I stuck it out so I could get to the 5k mark in running. I didn't feel horrible during any of it but I did feel like I was laboring a little more than usual. Temperature was about 80 degrees but humidity was way up. Or maybe it was tougher because I didn't find a hundred-dollar bill this time.
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