We are headed into the fall running season, which is bittersweet. Cooler temps can lead to PRs, but dark, rainy runs can be a big motivational drain! When my alarm goes off on a workday it’s still dark outside, and certainly if I try to get up any earlier to squeeze in a run. There’s still plenty of daylight after work for some miles, but we’re creeping into “bring a headlamp for the end” territory.…