Most of us were raised to believe you get older, your genes blow the whistle, your body ‘breaks.’ Fortunately for us, modern biology has been quietly rewriting that story and the new version is a lot more hopeful. Over the last few decades, researchers have mapped out a set of common biochemical changes which, over time, tend to push us in the direction of disease and frailty. These subtle shifts, known collectively as the ‘hallmarks of aging.’ The good news is that most, quite possibly all, of these hallmarks respond positively to healthy lifestyle habits. If a long, healthy life is what you’re shooting for, one of the hands-down most powerful habits you can cultivate is movement.