Running-related health questions crop up all the time, often at inconvenient moments. It can be hard to access the advice you need because health-care professionals are often unavailable at short notice and, without an interest in running, may not have the expertise to give adequate answers. Information from the internet is often dubious, anecdotal, and not evidence-based. Dr. Juliet McGrattan has been answering health questions from runners since 2012 and has worked as a family doctor and a health journalist. A keen runner herself, she has the experience and passion combined to create a helpful, accessible handbook for runners regardless of gender, fitness level, or training program.