You’ve likely heard the phrase “sitting is the new smoking.” The real issue, however, is more specific and more physiological: vascular stagnation.

When the body remains seated for longer than about 60 minutes, blood flow slows and the gentle shear stress on artery walls decreases. This stress is not harmful. In fact, it is what stimulates the release of nitric oxide, a molecule that helps blood vessels remain flexible and responsive.

Without regular movement, nitric oxide production temporarily drops. Vessels become less efficient at managing pressure and flow, which is why prolonged sitting during meetings, flights, or desk work can leave people feeling heavy, mildly swollen, or mentally foggy.

This response reflects normal vascular physiology, not lack of effort or motivation.

A full workout isn’t required to reverse this effect. Standing for a couple of minutes, stretching the calves, or taking a brief walk is often enough to restore blood flow and restart this protective vascular response.

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