Breaking up sitting

Of everything on this site, this is the change with the best ratio of evidence to effort.

The finding

In a randomised crossover trial, office workers alternated between sitting and standing every 30 minutes using a height-adjustable desk, and were compared with the same workers seated throughout. Lower-back discomfort fell by 31.8% in the alternating condition, and fatigue scores were significantly higher when seated throughout.¹

A six-month cluster-randomised trial of sit-stand workstations found improvements in overall fatigue, need for recovery after work, and musculoskeletal discomfort.²

How often

The trials that show an effect use intervals of 20 to 30 minutes. Shorter intervals have not been shown to add much; substantially longer ones drift back towards uninterrupted sitting, where postural drift accumulates.³

There is nothing magical about the number. The point is that the interval is short enough that tissue creep does not accumulate through the whole bout.

What counts as a break

Standing up is enough to reset the position. It does not need to be exercise.

• Stand while reading or on a call
• Walk to get water, rather than keeping a bottle at the desk
• Take stairs between floors instead of the nearest lift
• Move the bin, printer or kettle further away on purpose

The most reliable breaks are the ones built into where things are, not the ones that depend on remembering.

Why not just stand all day

Prolonged standing produces its own discomfort, and trials that replace sitting entirely with standing do not show better outcomes than alternating. The variable that improves is change of position, not which position you end up in.

If you cannot control your schedule

Shift work, clinical work and driving make fixed intervals impossible. The fallback is to take the break at natural boundaries — between patients, between stops, between tasks — and to accept an irregular pattern over none.

Standing desks and how long to stand

A height adjustable desk makes switching easy. A Cochrane review found that sit-stand desks reduced sitting by 84 to 116 minutes a working day in the short term, on very low quality evidence, without signs of harm.⁴ Standing has limits too: in laboratory studies, lower back discomfort reached clinically relevant levels after about 71 minutes of uninterrupted standing, and after about 42 minutes in people prone to it.⁵ Switching every 20 to 30 minutes keeps both sitting and standing bouts short. Setup and timing are covered in standing desks.

What to do in the break

Any change of position counts. If you want the break to do more:

• a few minutes of the five-minute desk routine adds the neck and shoulder strengthening that has its own evidence for desk workers;
• a short walk is the simplest option, see walking for back pain;
• a couple of chin tucks reset a head that has drifted forward.

Why the break works, in terms of what changes during a long bout, is in posture drift over a sitting bout.

Footnotes

1. Thorp AA, et al. Breaking up workplace sitting time with intermittent standing bouts improves fatigue and musculoskeletal discomfort. 2014. ↩

2. The effectiveness of a 6-month intervention with sit-stand workstations in office workers (SUFHA cluster RCT). 2024. ↩

3. Postural strategies among office workers during a prolonged sitting bout. Applied Ergonomics, 2022. ↩

4. Workplace interventions for reducing sitting at work (Cochrane review). 2018. ↩

5. Associations of prolonged standing with musculoskeletal symptoms: a systematic review of laboratory studies. 2017. ↩