Answer:
What kind of running means walking?
It comes only before, it comes only after. Rises only in darkness, but rises only in light. It is always the same, but is yet always different.
Three little letters. A paradox to some. The worse that it is, the better it becomes.
What is that which, though black itself, enlightens the world without burning?
What five-letter word becomes shorter when you add two more letters?
People take me on walks and I run and have fun. What am I?