Once a year, National Exercise Day gives us a collective moment to stop, reflect, and ask ourselves an honest question: are we moving enough? As physiotherapists, we'd gently suggest that for most people in the UK, the answer is probably no, and that's not a judgement, it's an invitation. Because here's the thing. Exercise is not a luxury reserved for the young, the fit, or the motivated. It is, quite literally, medicine. And the dose matters far less than most people think.