Recovery is the new frontier of athletic performance. The quicker you recuperate, the more you can train, and pro athletes across sports have been revitalizing their careers by taking time off. Now a wave of new recovery technologies are being pitched to a broader market: boots that improve blood flow, cryochambers, infrared pajamas. Science writer Christie Aschwanden saw all this and started looking into some of the product claims—and into classic recovery techniques like ice, massage, and ibuprofen. At a live event at Powell’s Books, in Portland, Oregon, she spoke with Outside Podcast host Peter Frick-Wright about her new book Good to Go, in which she lays out the surprising answers to the most important recovery question of all: What works and what doesn’t?