Amanda MacMillan is a freelance health and science writer whose work has appeared in Runners World, Shape, O, Good Housekeeping, and Health magazines. She is a fitness columnist for Outside Online and has competed in numerous Olympic- and Half-distance triathlons. When she’s not at her computer, you can find her in Brooklyn’s Prospect Park with her bike, a blanket and a good book, or her bulldog, Gus.
