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.\n\nQuestion: when does runner's world magazine come out?
A step-by-step solution is:
monthly
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.

.

The answer: monthly