Well, that felt unnecessarily tiring. I thought that to myself a couple of weeks ago after completing a typical, easy 7-miler along the local greenway trail, and I felt a bit defeated. I had kept up a normal pace, logging my miles at around 7:45 a clip, but I could never get in a rhythm. My heart rate crept higher than usual, my breathing seemed strained, and overall, it was one of those runs where you count down the miles until you’re back at your starting point. But instead of obsessing over the dismal data after saving my run on my watch, I pulled out my phone—and immediately opened up the weather app. One glance at the humidity , and all of my worries subsided. Whenever I have an easy day that feels, well, not easy like I expected, I always give the current weather conditions a quick look-over. That’s because your surroundings have an influence on your runs—even in the most subtle ways.…