Interesting stats on my last couple runs. I ran an easy 10 miles yesterday and today; different course/route, but the terrain/elevation about the same. On Wednesday's run, which I ran alone, I averaged 7:07 pace and 150 HR. In today's run, which I ran with my speedy friend Jurgen, I ran almost 4 minutes faster (:22 sec/mile faster) but still averaged the same HR (150). Both runs felt aerobically easy and good. Sometimes I wonder about the human body.