..so, I'm cleaning out my garage, find my infrared thermometer, and have an interesting idea. What if I keep track of various ground temperatures and (my) pain threshold as the air temps increase as summer approaches? Just to give you an idea of what I'm thinking, this afternoon, I checked a few surfaces. It's now sunny with an air temperature of 78* F. Here's clean (nearly white) concrete. At 114*, I could stand flat footed indefinitely: Dirty concrete (with tire rubber) increased temps to 125*. After 10s,I really wanted to move: Gravel was at 131*. I could not stand without "hot-footing": The asphalt road was at 130*, similar to the gravel: I typically run on variety of surfaces, and could easily graph rubberized track, grass and variations of shaded areas. Obviously, people have different pain thresholds, but each individual could make their own adjustments. Would this be useful to anyone else? I'm thinking, ultimately, of graphing the compiled results. This would also help motivate me to run as temps heat up.