What do you think about when you run alone?

Sometimes when running, I think about how to solve life's problems, sometimes I think about what to do at work. Sometimes, looking at the surrounding scenery, do some daydreaming. In short, running is a good time to think about problems, but also a good time to relax. Run up, the road under the feet in the extension, no matter how far the goal, each step is to the goal of the forward, accumulation step by step, to a thousand miles, so that you add to the courage to overcome the difficulties and achieve the goal.