Q: Context: Runner's World is a globally circulated monthly magazine for runners of all skills sets, published by Rodale Inc. in Emmaus, Pennsylvania, in the United States.

Question: when does runner's world magazine come out?
Let's give stream of consciousness below
The relevant sentence in the passage is: Runner's World is a globally circulated monthly magazine for runners of all skills sets, published by Rodale Inc. in Emmaus, Pennsylvania, in the United States. So the answer is monthly.