One Task a Day With the AI Off

A treadmill is a rubber belt looped over two rollers, a motor, and a screen counting the distance you aren't travelling. Nobody has to walk anywhere now, because there's a car, a bus or a lift. Yet somewhere in the last century, people started paying to walk on a machine that goes nowhere. Walking turned out to matter even after we stopped needing it.

Thinking is going the same way. The hard parts of your day are the ones where you have to hold a problem in your head and push. You can hand those off to AI now. Most days you'll hand them off and nothing bad will happen.

But hand off all of them, every day, and the pushing stops. The pushing was how your mind stayed in shape.

Cal Newport has written about focus and deep work for years. He calls this cognitive fitness, meaning keeping your mind in shape, and the idea is his. For most of history, hard thinking couldn't be avoided, so nobody had to plan time for it. Now hard thinking is optional, and anything optional that takes effort tends to stop. Nobody decides to stop, and yet we drift.

His useful idea is the difference between drudgery and strain. Drudgery is the dull, routine work, and that can go to AI. Think of the formatting, the first go at a routine reply, or the search for the thing you half-remember.

Strain is the part where you don't yet know what you think, and finding out is uncomfortable. Strain is where the thinking happens, so that's the part to keep.

That doesn't mean keeping all the strain, though. Newport himself uses AI for search and the routine parts of writing, and he says so. He isn't arguing that you should give AI up completely, and neither am I. For most of what you do in a day, less strain is a pure win. Treating every email as a workout just makes you miserable while you call it discipline.

Keep one thing hard and let the rest be easy. One task a day is enough to keep your thinking in shape, as long as you pick the right task. Even that rule can bend. If the only hard task has a deadline, and doing it without AI would cost you something real, then skip it.

Habits survive missed days, but what they don't survive is deciding the habit is for other people.

AI can help you find the task, and then AI leaves the room. Open tomorrow's calendar or to-do list.

Somewhere in that list is a task that's hard in the useful way. For that task, you have to work out what you think or make a judgement you can't look up. You want the task where the difficulty is the point, which won't always be the hardest one.

Here's my to-do list for tomorrow. [paste] I want to pick one task to do entirely without AI, as practice for my own thinking. Don't pick the biggest or the most important. Pick the one where the hard part is working out what I think, building an argument, or making a judgement that can't be looked up. Tell me which one and why, in two lines. Then suggest one task you'd rule out because the difficulty is only drudgery.

Block out the time and close the AI tab, because just trying not to use AI doesn't count. The point of the gym is that there's no lift. Your first version will be rougher and slower than you're used to, and that's the strain at work. So write the ugly first draft, sit with the question you can't answer yet, and don't tidy as you go.

Afterwards, if you like, bring AI back to check your work and point out problems, but never let AI replace what you made. Ask AI something like "Here's what I wrote. Where's the weakest point?" That makes AI a coach after the session, and the session is still yours.

When you're done, you may wonder if you picked the right kind of task. Ask yourself whether you know something now that you didn't know before. If you do, that was strain.

If you only produced something, that was drudgery. Tomorrow you pick again.

Credit. The idea of "cognitive fitness" and the difference between drudgery and strain are Cal Newport's ideas, from his 2026 writing and interviews on attention. Read him for the full case.