The “Inchworm Theory” Will Change Your Life

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The week you keep trying to get back to

You probably have a week you still think about.

You got up on time. You did the work you had planned. You trained, ate well, and went to bed at a decent hour. You dealt with things when they came up, instead of letting them sit in your head for days.

For once, your actions matched the standards you had set for yourself.

And you felt good for a reason. You had proof that you could live that way.

Then your schedule changed. A task took longer than you thought. You slept badly, had a tense call, or woke up with less drive than usual. You missed something you had planned to do. By the end of the week, a few old habits had returned, and you were trying to work out how you had lost so much ground so fast.

You might have spent the next month trying to recreate that good week. The same routine. The same start time. Maybe a new app to help you stay on track. Each change felt worth a try because you knew the level you wanted was possible. You had already been there.

But that good week gave you only part of the picture.

It showed what you could do when enough things went well. It gave you much less proof of what you could do when you were tired, pressed for time, or upset. Those conditions were still going to show up. And when they did, the habits you had used for years were still easy to fall back on.

This is where I think a lot of self-development goes wrong. You see your best week as the new standard, then judge every week that follows against it. You can spend months feeling behind while you miss the work that would make strong weeks more common.

There is a useful model for this.

Jared Tendler calls it the Inchworm Concept in The Mental Game of Poker. He used it to explain how poker players improve. I use it here as a way to think about growth in your work, health, relationships, and daily life.

The key idea is simple. You have a range of performance. Your best days sit at one end. Your worst days sit at the other. Most days fall somewhere in between.

Once you see the whole range, you can make better choices about what to work on. You can also stop treating each change in your mood or output as a verdict on all the progress you have made.

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Your best result tells you less than you think

Tendler calls your strongest performance your A-game. That is the level you can reach when your skills, focus, and choices come together. Your C-game is what you tend to do at your worst. The middle is where you spend much of your time.

You already know all three from your own life.

Take work. On a strong day, you start the task you had planned, give it your full focus, and finish something that matters. On an ordinary day, you get useful work done but lose some time to small tasks and distractions. On a weak day, you avoid the task, check your phone, and keep finding reasons to start later.

One person. A range of behavior.

The same is true in a hard conversation. You may be able to listen well, say what you mean, and keep your voice calm. You may also become sharp or shut down when you feel hurt. Both are part of the range you currently need to understand.

A new best result matters. If you handle a tense talk well for the first time, that tells you something about your growing skill. If you finish a difficult project with care, you have evidence that you can work at that level.

You should pay attention to those wins.

The next step is to find out how much you can repeat.

What helped you do well? Did you prepare? Did you start before the day became busy? Did you have fewer distractions? Did you notice your stress early and take time to settle before you spoke?

Look closely enough to find actions you can use again. Then try them on an ordinary day. You need to learn which parts of the result came from a skill you can practice and which parts depended on conditions you will rarely have.

Suppose you did three hours of focused work one morning. You had slept well, cleared your inbox the night before, and knew the exact task you would start. That gives you a useful place to begin. You can prepare the task in advance and remove the phone from your desk. You can test a shorter session when your energy is lower.

Over time, the question becomes whether focused work shows up more often across the week. You may still have one great session and several weak ones. That means the new level exists, while some of the work needed to support it remains unfinished.

Keep the measure specific.

If your goal is to become more focused, write down what that means in practice. How long will you work? On what task? What will you do when you feel the urge to switch? Clear choices let you see what has changed. A broad wish to be more disciplined gives you much less useful feedback.

If you want help choosing a target that fits the way you actually work, book a call with us. We can talk through where your current approach breaks down and what you want to improve.

The habits that keep making a bad day expensive

Now look at the other end of the range.

Your C-game often has a cost that lasts beyond the first mistake. You miss a work session, then avoid the project for two more days. You buy something on impulse, then put off checking your balance. You snap at someone, then stay distant because you do not want to deal with the damage.

That second part deserves your attention.

You will have days when you fall short. Sleep changes. Stress rises. Plans get interrupted. You cannot make every day feel like your best day.

But you can work on the behaviors that turn a brief drop into a much longer problem.

Start with a recent example. Choose a time when your performance fell and the effects lasted. Write down what happened in plain terms. Leave labels such as lazy or weak out of the account. They tell you little about what you need to change.

You might write that you received feedback on a draft, felt unsure how to fix it, and spent the afternoon checking messages. The next morning you avoided opening the file. By Friday, a small revision had become a late project.

That account gives you several useful points to examine. You can see the event that came first, the feeling that followed, and the action that made the problem grow. You can also see that the first afternoon was only part of the cost.

What was the earliest sign you could have noticed? Perhaps you kept opening new tabs. Perhaps you started doing low-value tasks while the draft remained closed. Perhaps you told yourself that you needed to feel clear before you could begin.

You need a response you can use at that moment.

For this example, you could open the draft, write down the part you do not understand, and work on one small revision for ten minutes. If you need help, you could send a specific question. You are giving yourself a way to stay in contact with the task while your confidence is low.

Make the response small enough to use on a hard day. A plan that requires two spare hours and a calm mind will fail under the conditions you are trying to address. Test it where the pattern actually happens. Change it if it asks too much of you in that state.

You can also change the setting. Put the phone outside the room. Decide the first task before you stop work. Leave a short note that tells you where to resume. These choices reduce how much you have to figure out when you are already struggling.

And check whether the plan itself needs to change. If your schedule leaves no room for meals, rest, or delays, some of the breakdown may come from what you are asking of yourself.

Raising your floor includes making the basic plan workable.

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Progress can look like a shorter bad day

Once you start working on your worst recurring behavior, use measures that fit the job.

How often does it happen? How much harm does it cause? How long does it take you to return to useful action? You may see a change in one of these before you see a change in the others. That still gives you information you can use.

Say you used to avoid a difficult task for three days. This month, you still felt the urge to avoid it, but you returned the next morning. You did not have a flawless week. You did spend less time stuck, and the task had less time to become a larger problem.

That is worth recording.

In a relationship, you may still feel defensive when someone raises an issue. Yet you begin to notice the urge to interrupt. You ask for a short pause, agree when you will return, and come back able to listen. The feeling remains, while the behavior and its cost begin to change.

Your health habits can improve in the same way. You may miss a planned workout during a busy week and still do a shorter session later. You may eat differently from your plan and return to a normal meal afterward. You keep enough structure that one disruption does not decide the rest of the week.

These changes can be easy to dismiss because they lack the clear result of a new personal best. You did not set a record. You did not finish a huge project. You simply stopped losing as much time to a pattern you know well.

But consider what that means over several months. More tasks get resumed. Fewer small issues remain unresolved. Your plans survive more of the real conditions in which you live.

You gain useful time without having to make each good day more intense.

I would be careful about calling every plateau progress. Sometimes your approach is too vague. Sometimes you have stopped practicing. Sometimes a target needs to change. The model gives you another way to examine a flat period, rather than a reason to assume all is well.

Look for evidence.

Are you returning sooner after a weak session? Are you making a mistake less often? Does your minimum routine hold when the week gets busy? If the answers have changed, there may be real improvement beneath a result that looks the same from the outside.

You can keep a short weekly note. Record one strong performance, one weak performance, and what you did after the weak one. Use similar situations where possible. A quiet week and a week with major demands may give you very different results, so include enough context to make the comparison fair.

Over time, you may find that a behavior you once managed only on your best days now appears on ordinary days. That is a useful sign that your range has moved.

You can trust the record more than the feeling that you ought to be further along.

Choose the next change you can actually practice

Here is how I would use this over the next few weeks.

Pick one area where a change would matter. Keep it narrow enough that you can observe what you do. If you choose work, focus on a task or type of session. If you choose relationships, focus on a recurring situation. Give yourself something concrete to review.

Look back at the last month or two. Find a few strong examples and a few weak ones. Describe the actions in each. Then write a brief account of your normal performance as well. This helps you avoid building the whole plan around one rare high or low.

Choose one skill you want to extend. It might be staying with a hard task for longer, preparing more clearly for a call, or saying what you need in a tense talk. Choose a level close enough that you can attempt it more than once.

Then choose one recurring weakness to reduce. Use its cost and frequency to guide you. If the same habit keeps taking whole days from you, it deserves attention even if another goal feels more exciting.

For that weakness, decide what you will notice first and what you will do next. Write a response that fits a difficult day. Try it. Review what happened. You may need to make the action smaller, prepare it sooner, or remove a source of friction before it becomes useful.

Give the pair of targets time.

Changing the plan after every weak day makes it hard to learn from your attempts. Keep enough of it stable that you can see whether it helps. You can adjust the details when you have a clear reason, while keeping the main behavior in view.

As your recurring weakness becomes less costly, you may have more room to work on the next skill. A harder task can then show you a new limitation. You practice that skill, see where it breaks down, and correct what you can. This is the alternating movement behind Tendler's Inchworm Concept.

You do not need to feel transformed to begin. You need a clear account of your current range and a change you can test. Your best week has already shown you something useful. Now examine what would help more of that behavior survive an ordinary week.

And pay close attention to what happens after a difficult day. The time between a mistake and your return to useful action may be one of the best places to begin.

If you want support applying this to your own patterns, book a call with us. We work with entrepreneurs, creators, and high performers on health, wealth, love, and self. We can talk about what you want to change and whether our approach fits.

Watch the Full Training: How to Make Progress Faster Than Everyone​

Talk soon,

Daniel