So It gets dark before 5 O'Clock nowadays. I state this not becuase I think you, the reader, are incable of interpreting a clock ( I assume you are because you are literate enogh to read ) but because this fact has some bearing on the phyisics of running. When I foolishly decided put off starting my training run untill four fifteen, I found myself in the middle of the woods forty minuites later with the sun sinking below the horizon and three miles of trails left to navigate. Phyisicly speaking, A couple things happened to me at that point. First, the subconience fear kicks in, the effect of too many horror movies, that I will be eaten by cyotes or kiddnaped or murdered by some deranged phycopath. This produces the aldrenaline rush, which sends me flying throgh the woods at an abnormal speed. Because every shadow is a potential lurking threat to my scared brain, I fail to look at the ground, and I forget newton's third law. Applied here, that means that when sneaker toe applies force to an unseen root, this root will push back and cause a runner to accelrate downward in a parabolic arc toward the ground, because his momentum will be stopped suddenly and unexpectedly. Thankfully, I cauhgt myself and managed to keep my fear under controll for the rest of the trip back. But a runner will stay in motion at a constant speed unless acted upon by the completion of his goal, and I ran, abiet carefully, all the way home. Moral of the story: always bring a flashlight.
P.S. don't judge me on the spelling my laptop does not have a right click and I have no way to spell check that I know of. You know you all rely on it as much as I do:)