This umbrella review examines how effective workplace interventions are at reducing sedentary behaviour and increasing physical activity. The clearest finding is that environmental changes, particularly sit-to-stand desks, consistently reduce occupational sitting time, in some cases by over an hour per workday. Step counts also increase when self-monitoring is combined with behavioural support strategies. However, increases in moderate-to-vigorous physical activity are inconsistent, and many parts of the evidence base are rated low or very low certainty.
The message is not that workplace movement initiatives fail, rather that effects are outcome-specific, often modest, and confidence in the strength and durability of evidence varies.