The human body is an intricate system, with organs, tissues, and bones working both solo and together to keep everything running smoothly. The #1 good-health goal for all of us should be to keep it humming along for as many years as possible. To help you reduce risk for disease and add years to your life, Prevention has put together a comprehensive guide of the best health advice spanning all of your most important organs: your heart, brain, lungs, reproductive system, and more. We offer actionable health tips on more than 75 common health concerns, as well as some cool info about how your organs work in the first place. Knowledge is power: Consider this your must-have owner’s manual for your entire body.