People who hike every chance they get aren't doing it just for the ’gram. Anyone with a working understanding of their own body knows that walking around in nature just makes you feel better. In her new book, The Nature Fix, journalist Florence Williams digs into the science behind why forest bathing calms your mind and sharpens your senses. Williams is a terrific writer and speaker who has spent a lot of time in the wilderness, and she'll have some good cheat codes for city kids who want the same feeling but don't own a pair of hiking boots. by Rich Smith