The words "alive" and "walking around" mean basically the same thing and are combined to emphasize living people. (See: [[rc://en/ta/man/jit/figs-parallelism]])
This refers to things that are done on earth. See how you translated this in [Ecclesiastes 1:3](../01/03.md). Alternate translation: "on the earth" (See: [[rc://en/ta/man/jit/figs-idiom]])