Why am I too exhausted to train after work when all I did was sit at a computer?

Because the exhaustion is real — it is just not the kind that rest fixes. A long screen day drains you through three channels that have nothing to do with muscular work. First, sustained cognitive load: hours of decisions, focus, and inbox vigilance deplete exactly the mental resources that a quality training session runs on. Second, visual strain: reduced blinking and hours of fixed near-focus produce the heavy-eyed, headachy fog that prevalence reviews find in roughly half of computer users. Third — and least appreciated — stillness itself: your physiology in unbroken sitting is measurably different from your physiology with movement sprinkled through the day, down to how your body handles the glucose from lunch, as Dunstan's interrupted-sitting trials showed.

Stack the three for eight hours and you walk out flat, stiff, and wired at once — a terrible launch state for training, but importantly, not actual physical fatigue. This is why the do-I-skip-tonight debate is usually miscalibrated: your muscles are fresh; your arousal and attention are spent. Two interventions fix most cases. During the day, interrupt the stillness: a repeating 30-45 minute timer, two minutes of movement each time it fires — walk, stairs, ten squats, a doorway stretch. The trial evidence here is encouraging and specific: brief hourly activity breaks improved self-reported energy and vigour across the workday, outperforming even a single longer morning walk.

Distribution beats dose; ten tiny breaks beat one heroic one. Add the 20-20-20 eye rule and an after-lunch daylight walk. At day's end, run a hard transition ritual: laptop closed, ten slow breaths with long exhales, five minutes of hip and thoracic mobility, then travel to the gym. The ritual is doing real work — it shifts arousal out of the flat-wired screen state before you attempt to train in it. Then let the warm-up decide, not the couch: commit only to arriving and completing ten minutes. The majority of too-tired evenings dissolve during a proper warm-up, and the sessions that still feel empty after ten honest minutes have earned a shortened version — twenty minutes, two exercises — which keeps the habit alive at near-zero cost.

If exhaustion persists despite better breaks, real sleep, and reasonable training — or if it comes with persistent low mood or dread — stop troubleshooting logistics: see a doctor to rule out other causes, and a licensed psychiatrist or psychologist if the weight of it is emotional. For the standard case, though, the verdict is optimistic: you are not too tired to train. You are un-transitioned. Build the breaks and the ritual, and the evening session comes back.

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