The Fit Check is a two-question framework for understanding one of the most consequential distinctions in personal growth: determining whether a difficult outcome is asking for more from you or asking something different from the environment around you. In this solo episode of Passion Struck, John R. Miles brings together ideas from Angela Duckworth’s Situated and Jared Diamond’s Profits, Prophets, Coaches and Kings to explore how much of our performance, character, and impact comes from who we are and how much emerges from the situations in which we live and work.
The episode begins with an observation about Harry Truman that becomes a useful lens for the entire conversation. When Truman became president following Franklin Roosevelt’s death, historians have argued that roughly 95 other sitting senators could have performed the basic responsibilities of the presidency. That raises an uncomfortable but important question about our own lives. In some circumstances, our contribution is highly distinctive. In others, capable people could occupy our position and produce a similar result. Understanding the difference changes how we should allocate our effort.
John reflects on two weeks spent in Blue Ridge, Georgia, where time on Lake Nottley and hikes through the mountains created a version of himself who felt clearer, slower, and more patient. The experience prompted a deeper question: did the mountains make him a better person, or did they simply remove an environment that had been demanding constant attention and triggering the wrong responses? That question becomes the doorway into the central idea of Situated: human potential is shaped by the interaction between the individual and the situation.
When Grit Meets the Situation
Angela Duckworth helped make grit one of the defining ideas in contemporary conversations about perseverance, yet her newer work in Situated: Find the People and Places That Bring Out Your Best expands the picture considerably. Grit remains valuable, while the environment determines many of the conditions under which persistence can actually translate into progress. This distinction reaches back to the foundational social-psychology work of Lee Ross and Richard Nisbett in The Person and the Situation, which examined the powerful influence circumstances can exert on human behavior.
John explores this distinction through the experience of West Point’s Cadet Basic Training. Over several decades, researchers observed a relationship between grit and the likelihood that cadets would complete training in a given year. Yet completion rates steadily increased across roughly four decades while admissions and physical standards remained intact. Former West Point superintendent General Robert Caslen summarized the institutional lesson for Duckworth in a simple observation: “It’s not the cadets, it’s the culture.”
West Point had gradually shifted from an attrition model designed primarily to identify who could survive to a developmental model designed to help cadets become stronger. The people entering the institution had not suddenly developed extraordinary reservoirs of willpower. The surrounding system had changed so that effort had a greater opportunity to produce the desired outcome. The lesson extends well beyond military training. When sustained effort repeatedly fails to produce progress, examining the structure surrounding that effort can reveal possibilities that another round of self-discipline would leave untouched.
The Environment Can Call Forth a Different You
John then explores the idea of psychological “modes,” drawing on the work of psychologist Aaron Beck. Rather than viewing personality as a completely fixed expression of who we are, this perspective suggests that our minds can move into different reflexive states depending on the circumstances surrounding us. The same person can become defensive and withdrawn in one environment and focused, confident, and capable in another.
This provides a more nuanced way to understand experiences that are often interpreted as personal shortcomings. Sluggishness, cynicism, disengagement, or irritability can sometimes reflect an environment that continually activates an unproductive mode. A setting characterized by hostility and micromanagement can produce a very different response from one that combines meaningful challenge with genuine support.
John’s experience in the mountains becomes a personal example of this principle. The change in environment did not manufacture a new personality. It created conditions in which a different existing capacity could become easier to access. That distinction matters because it changes the question we ask ourselves. Instead of immediately concluding that we need to become a different person, we can examine what our surroundings are repeatedly asking our nervous system, attention, and behavior to become.
The Mattering Market and the Conditions That Shape Our Worth
The conversation takes another dimension when John connects these ideas to his own research for The Mattering Effect. While interviewing Stanford researcher Jamil Zaki, John encountered Zaki’s description of a “marketplace” in which people move through environments such as work, school, and family while implicitly being asked to demonstrate their usefulness before they are treated as though they possess value.
John recognized a striking convergence with the concept he has been developing as the Mattering Market. The connection reveals an important dimension of environmental fit: situations influence more than productivity. They can influence our sense of whether we belong, whether our contributions are recognized, and whether we experience ourselves as consequential to the people and systems around us.
This matters because environments that continually condition belonging on performance can create a cycle of striving that becomes difficult to distinguish from healthy ambition. A person may continue working harder because the environment keeps moving the threshold for feeling valued. Over time, the individual can interpret the resulting exhaustion as evidence of insufficient grit when the deeper issue involves the conditions under which their sense of mattering has been established.
The Fit Check therefore becomes relevant to identity as well as performance. Understanding the room means examining the invisible expectations embedded within it: what does this environment reward, what does it discourage, what version of me does it repeatedly bring forward, and what does it require me to prove before I feel that I matter?
The Hamlet Test: Discovering When the Individual Truly Matters
Jared Diamond approaches the person-versus-situation question from another direction in Profits, Prophets, Coaches and Kings: (When) Do Leaders Matter? His work asks whether particular leaders genuinely changed the course of events or whether circumstances would have produced a similar outcome with another capable person occupying the same position.
Diamond’s Hamlet Test provides a useful counterweight to the environmental argument. The question is whether another person, living at precisely that moment and possessing the same available opportunities, could have produced what the individual produced. The answer varies dramatically depending on the person and circumstance.
Harry Truman provides one example. Diamond argues that many other sitting senators could have assumed the responsibilities of the presidency when Truman did and performed the basic function effectively. Shakespeare provides the opposite case. Elizabethan England contained numerous working dramatists, yet the particular combination of Shakespeare’s experience, opportunities, previous work, theatrical environment, and creative ability produced Hamlet in a way that another contemporary playwright could not simply have replicated.
The distinction creates a more mature understanding of responsibility. Some problems call for a better environment because the individual is working inside conditions that prevent effort from translating into results. Other moments genuinely depend upon the individual. In those moments, changing the environment becomes an incomplete answer because the contribution itself belongs to you.
In this episode, You’ll Learn:
- Why Angela Duckworth’s work on Situated expands the traditional understanding of grit by showing how strongly environments influence whether effort produces results.
- What the West Point Cadet Basic Training experience reveals about the relationship between individual perseverance, institutional culture, and environmental design.
- How psychological “modes” can cause the same person to behave very differently depending on the environment and why certain struggles may reflect environmental fit rather than character.
- How Jamil Zaki’s marketplace of mattering connects with John’s Mattering Market and the environments that condition belonging and worth on demonstrated usefulness.
- How Jared Diamond’s Hamlet Test distinguishes people whose contributions are replaceable from those whose unique presence genuinely changes an outcome.
- How to use the two questions of the Fit Check to determine when to redesign your environment and when to recognize that the work genuinely belongs to you.
The Fit Check: Two Questions for Better Decisions
John brings these ideas together in a practical framework designed to take only a few seconds. The first question examines whether your presence is actually the decisive variable:
If I removed myself entirely from this exact situation, would the outcome basically stay the same?
When the answer is yes, the situation deserves closer examination. The opportunity may lie in redesigning the environment, removing friction, changing a routine, establishing a boundary, or placing yourself somewhere that allows effort to work more effectively.
The second question examines whether the outcome depends upon something uniquely yours:
Is there any version of this where the outcome depends specifically on me, and nobody else could produce it?
When the answer is yes, the situation contains what John calls the Hamlet moment. The responsibility belongs to you. No change in circumstances can substitute for the contribution only you can make.
Together, these questions help distinguish two forms of effort that often become confused. One involves trying to overcome an environment that continually works against the desired outcome. The other involves giving your full attention to an outcome that genuinely depends on you. John argues that much of our exhaustion comes from applying the intensity required by the second situation to problems that belong to the first.
Why Mattering Begins With the Room Around You
The ideas in this episode also point toward a broader question at the center of John’s upcoming book, The Mattering Effect: What happens to a person when the environments around them consistently communicate that their presence has value?
The connection between situated behavior and mattering is significant because people do not experience environments as neutral backdrops. The culture of a workplace, the dynamics of a family, the expectations of a community, and the structure of an institution can all influence whether people feel trusted, useful, visible, and capable of contributing something meaningful.
The West Point example illustrates this at an institutional level. The transformation occurred partly because the environment was redesigned to help people develop. The Mattering Market extends the question into the realm of human worth: what happens when environments are structured around continual proof of usefulness? Together, these ideas suggest that human flourishing depends partly on the conditions through which people encounter challenge, recognition, belonging, and responsibility.
That connection will become increasingly important as John develops the ideas behind The Mattering Effect. Mattering is not simply a feeling we generate internally. It is also shaped through relationships and systems that communicate whether our contributions are seen and whether our presence carries significance. Understanding the room therefore becomes part of understanding the person.
Designing a Life That Brings Out Your Best
The practical implication of the Fit Check is a more deliberate approach to personal responsibility. Instead of treating every obstacle as a test of character, we can become more precise about the relationship between our effort and the conditions surrounding it. A draining evening may call for a different relationship with technology, while a meaningful conversation with a child may call for our undivided presence. A dysfunctional workplace may require environmental change, while a piece of work that carries our unique perspective may require deeper personal commitment.
John applies this distinction to his own life after returning from the mountains. The goal is not to recreate Blue Ridge every evening. The lesson is to identify what made that version of himself easier to access and then redesign ordinary life accordingly. Putting the phone in another room, walking instead of scrolling, or creating screen-free time at dinner can change the conditions without requiring an extraordinary reserve of willpower.
This is where the Fit Check becomes more than a productivity tool. It becomes a way of deciding where our finite attention belongs. Some environments deserve redesign. Some responsibilities deserve deeper commitment. The skill is learning to tell them apart.
Enjoy the Show? Listen to Episode 816
If you’ve ever wondered whether you need more willpower or simply need to change your environment, Episode 816 explores The Fit Check and the two questions that can help you know the difference.
Explore The Mattering Effect for a deeper framework on building genuine significance, strengthening connection, and creating environments where people know they matter. The book is available wherever books are sold.
Listen to Episode 816 of Passion Struck with John R. Miles on Spotify, or watch the full episode on our YouTube Channel.
For weekly companion essays, practical toolkits, and interactive reflections, join our community at The Ignited Life on Substack.
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About the Author
John R. Miles is the author of Passion Struck, winner of the Gold Stevie® Award for Best Business Book and a Next Big Idea Club Must-Read, and host of the Passion Struck podcast, with more than 85 million downloads.
A former Fortune 50 executive and U.S. Navy officer, he has spent more than two decades synthesizing insights from psychology, neuroscience, behavioral science, leadership, and human flourishing to understand why so many people quietly lose their sense of significance despite outward success.
His work has been featured in Fortune, Inc., Forbes, ABC, NBC, Fox, and Writer’s Digest, and he has appeared on leading podcasts including 10% Happier with Dan Harris, The Next Big Idea Daily, and FranklinCovey On Leadership.
You Don’t Need More Willpower. You Need to Change THIS | John R. Miles
Frequently Asked Questions
What is the Fit Check?
The Fit Check is a two-question framework developed by John R. Miles to help determine whether a difficult situation calls for personal change or environmental change. The first question asks whether the outcome would remain essentially the same without you. The second asks whether the outcome depends specifically on something only you can contribute. Together, they help clarify where effort is most meaningfully applied.
Does the situation matter more than willpower?
The episode argues that the situation can matter enormously because environments influence which behaviors, psychological modes, and opportunities for effort become available. Willpower remains important, yet effort produces different results depending on the conditions surrounding it. The more useful question is often how personal effort and environmental fit interact.
What is Angela Duckworth’s Situated about?
Situated: Find the People and Places That Bring Out Your Best expands Angela Duckworth’s earlier work on grit by examining how people and environments interact. The book builds on the idea that grit is valuable while also recognizing that the situations people inhabit can substantially influence how effectively their effort translates into achievement and growth.
What does “grit necessary but not sufficient” mean?
Grit describes the capacity to persist toward meaningful goals over time. The episode explores why persistence alone cannot account for every outcome. When an environment continually prevents effort from producing progress, increasing persistence may have diminishing returns. Changing the conditions can sometimes make the same amount of effort substantially more effective.
What is the Hamlet Test?
The Hamlet Test comes from Jared Diamond’s exploration of when individual leaders matter. It asks whether another person living at the same moment, with comparable opportunities, could have produced the same outcome. The contrast between Harry Truman and William Shakespeare illustrates the distinction: Truman’s presidential role was comparatively replaceable, while Shakespeare’s creation of Hamlet represents an outcome deeply connected to his particular capabilities and circumstances.
What is the Mattering Market?
The Mattering Market is John’s concept for understanding environments in which people feel required to demonstrate their usefulness, achievement, or value before receiving recognition that they matter. The idea connects with Stanford researcher Jamil Zaki’s description of a “marketplace of mattering” and extends the episode’s broader exploration of how environments shape human behavior and self-perception.
How can I apply the Fit Check to my own life?
Start with one situation that repeatedly drains you. Ask whether the outcome would remain essentially unchanged if you removed yourself from the situation. If so, examine what could be redesigned around you. Then identify one responsibility where your presence genuinely changes the outcome and consider what it would mean to give that responsibility your full attention. The goal is to direct effort according to the nature of the problem rather than applying maximum intensity everywhere.
