A couple of new records today: The fastest 10 K (1:12:50)and the most calories burned (1603). I didn’t try to establish any new records. I didn’t even pay attention to the pace. I just chose a route and ran comfortably. My heart rate did hit 210, but that was at the steepest part of the trail at the 5.88-mile mark. And it was just a quick spike, nothing extensive.