You have probably felt it. It is ten in the morning, you slept well, the coffee is working, and the task in front of you is one you actually care about. Still, after four minutes the work starts to feel heavy, like walking uphill in wet clothes. You start to suspect something about yourself that you would never say out loud: that you're lazy, that something in you is broken, that other people can do this and you can't.
There's a decent chance that suspicion is wrong. The heaviness may not be a fuel tank running dry. It may be your brain doing a quiet calculation, and you can change what goes into that calculation.
The tank that probably isn't there
For about twenty years, the most popular explanation for why concentration feels draining was ego depletion. The idea was that self-control runs on a limited resource, like a muscle that tires, and every act of willpower spends some of it. The idea was intuitive and widely cited, and it fit how a long afternoon feels.
Then the replications came in. In 2016 a large multi-lab project coordinated by Martin Hagger and colleagues tested a standard depletion procedure across more than twenty labs and found an effect close to zero. Later large-scale attempts have also struggled to reproduce the classic results. The debate isn't fully settled, but the simple version of the story, where willpower is a substance you burn through, is now on much shakier ground than the self-help shelf suggests.
This matters for a personal reason. If you believe focus is a tank, then struggling to concentrate reads as proof that your tank is small. That belief is hard on your self-worth, and it might also be the wrong picture.
A different idea: effort as a price tag
In 2013, the psychologists Robert Kurzban, Angela Duckworth, Joseph Kable, and Justus Myers proposed an alternative in the journal Behavioral and Brain Sciences. They called it the opportunity cost model of subjective effort.
The core claim goes like this. The cognitive machinery you use for focused work, mainly working memory and executive control, can only do a few things at once. When you point it at one task, you can't use it for anything else. In this model, the feeling of effort is a signal that tells you what that choice is costing. Roughly, it says: this is what you're giving up by staying here.
So the feeling of effort isn't a reading of how much fuel is left. It works more like a price tag, and the price goes up when the other options look better.
The model is a theoretical proposal and researchers still argue about it. But it fits a lot of everyday experience that the tank model can't explain. Hours can disappear into a hard video game or a difficult puzzle you chose yourself, with no sense of depletion, while twenty minutes of a spreadsheet leaves you wrung out. If effort were just fuel burned, the game should drain you too. If effort is about what else you could be doing, the difference makes sense. While you're absorbed in the game, nothing else is competing for you.
Your brain is shopping, and the phone is in the cart
There is related work on what researchers call cognitive effort discounting. In experiments by Andrew Westbrook, Todd Braver, and colleagues, people were offered choices between an easier task for less money and a harder working-memory task for more. Many people gave up real money to avoid the harder mental work. Effort has a subjective cost that people trade against rewards, and that cost differs between people and between situations.
Put that next to the opportunity cost model and think about your actual working conditions.
A century ago, the alternative to concentrating on a dull letter was staring at a wall. Today the alternative is a device within arm's reach that holds conversations with people you love, an endless stream of new things, and the small hits of being noticed. In the opportunity cost picture, every one of those options sits in the comparison. Your brain isn't weighing the spreadsheet against nothing. It's weighing it against the best thing your phone could be offering at that moment.
This framing is speculative, and it's an extension of the model, not a tested finding about phones. But it gives a useful reframe. When focus feels unbearable, you may not be weak. You may be in a market where the competition is very strong.
That's also why the feeling arrives so fast. You don't have to think about checking your messages for the option to register. Simply knowing it's available may be enough to raise the price.
The other half: effort can be worth something
The story would be bleak if it ended there, as though effort were only a cost to minimize. It isn't.
In 2018, Michael Inzlicht, Amitai Shenhav, and Christopher Olivola published a paper in Trends in Cognitive Sciences called "The Effort Paradox." Their point was that people avoid effort and value it. People climb mountains for no prize. Many care more about meals they cooked and furniture they assembled. Michael Norton and colleagues documented this with what they named the IKEA effect: people tend to value things more when they've put labor into them.
So effort isn't purely a cost. It also produces meaning. The same hour of concentration can feel like punishment or like something you're proud of, depending on what it's connected to.
That gives you two levers:
- Lower the value of the alternatives so the price of staying goes down.
- Raise the felt value of the work itself so the price seems worth paying.
Most focus advice pushes only on willpower, which, if the opportunity cost model is right, misses how the problem works.
What this looks like in a real morning
Picture two versions of the same person sitting down to write a difficult proposal.
In the first, the phone is face-up beside the keyboard, the email tab is open, and the goal is "work on the proposal." The task is vague, the alternatives are vivid, and the price tag on every minute is high. Around minute six, the person reaches for the phone and calls it a break. Later they feel quietly ashamed.
In the second, the phone is in another room and the email tab is closed. The goal is "write the three sentences that explain why this project matters to the client." They have also told a colleague they'll send a draft by noon. The alternatives are harder to reach, the task is concrete enough to feel winnable, and finishing it now means something to another person. The work is just as hard. It only feels lighter.
The person is the same in both versions, and so is their capacity. The difference is in what the work is being compared against.
Your next moves
- Move the best alternative out of the room. Before your next focus block, put your phone somewhere you'd have to stand up and walk to. Your goal is to take the most attractive competitor out of the comparison, so willpower has less to do.
- Close every tab that could be a better offer. Email, messaging, news, and social feeds all add to the price. Open only what the task needs, then start a timer for 25 minutes.
- Shrink the task until it's clearly worth doing. Swap "work on the report" for one finished, nameable output: "draft the opening paragraph" or "fix the three broken formulas." Concrete wins make the work feel more valuable.
- Attach the work to someone or something you care about. Write one line at the top of your document: who this helps, or what it moves you toward. Then tell one person when they'll see it. This puts the effort paradox to work for you.
- Name the feeling instead of judging yourself. When the heaviness arrives, say to yourself, "this is the price tag, not a verdict on me." Then decide whether to keep paying it for ten more minutes. Treat it as a choice, not a failure.
The quiet relief of a better comparison
The most useful part of this idea may be what it does to the story you tell about yourself. If concentration feels hard, that doesn't have to mean you lack something other people have. It can mean you're making a sensible calculation in a setting built to make every other option look brighter. You can change that setting, and doing so isn't cheating.
That's the idea behind Reclaim. It doesn't try to make you tougher. It makes the alternatives harder to reach during the hours you've set aside, so the work you care about doesn't have to compete with everything else at once. If you'd like to try a setup where focus costs a little less, you can start at reclaim.lumenlabs.works.