A scroll is a different load, not an absence of load
Attention isn't restored by doing something else that demands attention. Short-form video is a rapid, high-stimulation cognitive load — you are working, just at something more rewarding. And it has a second cost: five minutes of novelty every four seconds recalibrates what 'boring' feels like, so a textbook that was tolerable now feels unbearable.
Boring breaks are the ones that work
- Stand up and move. Anything, for two minutes.
- Look at something far away. Six metres or more — it rests the eyes, and there's a plausible case that unfocused visual attention helps more generally.
- Go outside, even briefly. Consistently the best-performing break in the research.
- Get water. Make a drink. Stare out of a window. Let the problem sit — insight has a habit of arriving in exactly this gap.
- Say nothing to anyone. A conversation is a load too, and a good one will eat the twenty minutes you didn't have.
It is unglamorous advice and it is unpopular for exactly that reason. The break that works is the one that feels slightly dull, and there is no way around this.
How long, and how often
Roughly five minutes every 25, or ten every 50 — but this is a knob, not a law. The 25 minutes is arbitrary; it came from a kitchen timer. What isn't arbitrary is that skipping breaks entirely degrades the back half of your day, and people skip them precisely when the work is going well, which is when it costs most.