Grit: The Power of Passion and Perseverance

By Angela Duckworth

Why This Book Matters

If I had to recommend one book that explains why some people succeed and others don't — regardless of talent, intelligence, or background — it would be this one.

Angela Duckworth's Grit is built on a simple but powerful idea: the most reliable predictor of long-term success isn't talent. It's grit — a combination of sustained passion and perseverance for long-term goals.

Not enthusiasm. Not motivation. Not raw ability.

Grit.

And having spent over twenty combined years in the military, hostile environments, endurance sport, and business, I can tell you — this book doesn't just make sense on paper. I've seen it play out, again and again, in every environment I've worked in.

Effort Counts Twice

One of the most powerful ideas in the book is Duckworth's effort equation:

Talent × Effort = Skill

Skill × Effort = Achievement

Effort appears twice. It builds the skill, and then it makes that skill productive.

Without effort, talent is just unmet potential. Without effort, skill is just what you could have done but didn't.

I saw this firsthand in Commando training. Sixty-five of us started. Thirteen finished. And it wasn't the fittest who made it through.

One lad — young, didn't necessarily stand out in any way physically — rolled his ankle in the first mile of the 30-miler. Finished the whole thing. Broken tibia. We only found out from the X-rays afterwards.

Meanwhile, I've seen people who were physically superior — fitter, stronger, faster — quit. Not because their body failed. Because their head did.

Talent gets you to the start line. Effort gets you across the finish.

It Predicts Success Everywhere

One of the most striking things about Duckworth's research is that she didn't find grit in one environment. She found it everywhere she looked.

At West Point Military Academy, she studied which cadets survived Beast Barracks — a brutal six-week summer programme designed to push people to their limits. The academy's own Whole Candidate Score, which carefully measured academic ability, physical fitness, and leadership potential, couldn't predict who would make it through. Duckworth's Grit Scale could.

At the National Spelling Bee, she found that grittier kids consistently advanced further in competition. Not because they were smarter — but because they practised more, practised more deliberately, and sustained that effort over a longer period. While other children relied on natural ability and dropped away when things got harder, the grittiest competitors kept showing up and kept working on their weaknesses.

She studied rookie teachers working in some of the toughest schools in America and found the same pattern. The teachers who stayed — and who actually improved outcomes for their students — weren't necessarily the most qualified. They were the ones who persevered through the difficulty of the environment and kept refining their approach.

She partnered with private companies and studied salespeople. Same finding. The grittiest salespeople kept their jobs longer and earned the most money. Not because they were the most naturally talented at selling — but because they kept going when others gave up.

And in one particularly fascinating finding from an Ivy League university, Duckworth discovered that smarter students actually had less grit than their peers who scored lower on intelligence tests. The implication is significant: when things have always come easily, people don't always build the muscle of perseverance. And those who had to work harder to be there often outperformed their more naturally gifted peers because effort, not ability, was driving their results.

Across every context — military, academic, educational, commercial — the pattern held. Grit predicted success more reliably than talent, intelligence, or any other single factor.

And critically, the Grit Scale itself is domain-general. It doesn't measure grit for a specific activity. It measures the underlying trait — which means grit transfers. The perseverance you build in one arena travels with you into the next.

I've seen this play out across my own career. The vehicle has changed constantly — getting fit after being an overweight dropout, joining the Royal Marines, passing Commando training, serving in Afghanistan, working in hostile environments and close protection, then moving into fitness, racing Ironman, pursuing mountain leader qualifications, building a business, going back to postgraduate study in my forties.

The context changed every time. But the underlying process was always the same:

Find a vehicle — something that demands growth.

Get support — coaches, teammates, a troop around you.

Do the reps — deliberate, uncomfortable, consistent practice.

Review and evaluate — then repeat.

That cycle has worked in every chapter. The grit built in one transferred directly into the next.

Now, with a family and a business, the big physical challenges are on the back burner. But the grit hasn't gone anywhere. It just finds a different vehicle — cold water swimming and ice baths, daily discipline, building something that matters.

Grit doesn't expire. It compounds.

Enthusiasm Is Common. Endurance Is Rare.

This is one of the most powerful lines in the book, and I see it every single year.

At Be Fearsome Outdoors, we get a wave of new members every late spring and early summer. Full of energy. Motivated. Excited to train outside.

By October, most of them have gone.

Not because they couldn't do it physically. But because when the mornings got darker, the weather turned, and the initial excitement wore off — they stopped.

The members who are still with us years later aren't necessarily the fittest. They're the most consistent. They show up in January the same way they show up in July.

That's grit. Not a burst of enthusiasm — sustained effort over time, especially when it stops being fun.

Wise Coaching — The Environment That Builds Grit

One of the most practically useful ideas in the book is what Duckworth calls wise parenting — or wise coaching, because she extends the same framework to coaches, teachers, leaders, and anyone responsible for developing others.

It sits on two axes: how demanding you are, and how supportive you are.

That creates four quadrants. Demanding but unsupportive is authoritarian — high standards delivered without warmth. Supportive but undemanding is permissive — all encouragement, no challenge. Undemanding and unsupportive is neglectful — the worst outcomes by a significant margin. And demanding combined with supportive — what Duckworth calls wise — is where the strongest results consistently sit.

The research behind this is substantial. Duckworth references the work of psychologist Larry Steinberg, who studied approximately ten thousand American teenagers and their parents' behaviour. His findings, consistent across four decades of research, were clear:

Children of wise parents — regardless of gender, ethnicity, social class, or marital status — earned higher grades, were more self-reliant, experienced less anxiety and depression, and were less likely to engage in delinquent behaviour.

The effect carried into adulthood. Children of neglectful parents drank alcohol and smoked at twice the rate of their wise-parented peers and showed significantly more antisocial behaviour, anxiety, and depression. Children of indulgent parents — supportive but undemanding — fared only marginally better than those who were neglected entirely.

Steinberg's conclusion was so definitive that in his 2001 presidential address to the Society for Research on Adolescence, he proposed a moratorium on further research into parenting styles — because the evidence was so overwhelming that scientists could move on to other questions.

Duckworth is honest that her own specific research linking wise parenting directly to grit hasn't yet been conducted quantitatively. But drawing on the broader evidence and her qualitative interviews with grit exemplars, her position is clear: the combination of high standards and genuine support creates the conditions where grit is most likely to develop. And when that combination comes from more than one source — home and school, home and sport, home and a coach — the positive outcomes compound significantly.

I use this framework constantly. Not just in coaching, but at home.

Recently, dealing with some boundary-testing behaviour from one of my boys at school, I leaned into exactly this approach. Supportive but clear. Firm but fair. Demanding of the standard, but delivered with warmth and explanation.

In a conversation with one of his teachers shortly after, I discovered they operated with exactly the same philosophy. They'd never read the book. They'd never heard of wise parenting. But instinctively, they were in that upper right quadrant — holding high expectations while making sure the child felt supported and respected.

And the effect was visible. When that combination comes from two different places — home and school — children respond differently. They don't just comply. They understand. They grow.

That's the kind of environment you want to seek out for your children.

That's what wise coaching looks like in practice. And it applies beyond parenting — to every team, every organisation, and every leader responsible for developing other people.

Growth Mindset and Grit — The Virtuous Cycle

Throughout the book, Duckworth draws heavily on Carol Dweck's growth mindset research — and the connection between the two is hard to ignore.

Dweck's work, explored in her book Mindset, shows that people who believe their abilities can be developed through effort consistently outperform those who believe ability is fixed and innate. I'd already read Mindset before picking up Grit, and it's a book I firmly believe in and regularly recommend alongside this one.

Duckworth takes it further. Her research shows that growth mindset and grit are locked in a virtuous cycle:

Believing you can improve leads you to put in the effort.

That effort builds skill.

And building skill reinforces the belief that you can improve.

The cycle compounds over time.

Conversely, a fixed mindset leads to pessimistic explanations of adversity — and that leads to giving up on challenges and avoiding them altogether.

The practical implication is significant: how we talk to people about their performance matters. Praising effort over talent. Framing setbacks as temporary, not permanent. Using "not yet" instead of "can't."

These aren't soft concepts. They directly influence whether someone develops the perseverance to push through difficulty or gives up when things get hard.

If you've read Mindset, Grit is the natural companion. Where Dweck explains the belief system, Duckworth shows what happens when that belief system meets sustained, deliberate effort over time.

Purpose Develops Over Time

Another insight that resonated deeply is Duckworth's finding that purpose doesn't arrive fully formed.

Interest comes first. Then practice deepens it. Purpose — connecting what you do to something beyond yourself — develops later, through experience and maturity.

That's exactly how my own journey played out. I didn't set out to be a leadership coach. I started in fitness because I needed to change my own life. Over time, through coaching, events, security work, and team development, the purpose revealed itself.

It wasn't a lightning bolt. It was gradual.

And I think that's important for people to hear — especially younger people or those in transition. You don't need to have it all figured out. You just need to stay curious, keep putting the effort in, and trust that purpose grows from sustained commitment, not from waiting for inspiration.

Who This Book Is For

This book is for anyone who has ever doubted whether they have what it takes.

If you've been told you're not talented enough, not smart enough, not the right fit — this book will challenge that narrative with evidence, not motivation.

It's also essential reading for anyone responsible for developing others — leaders, coaches, parents, teachers. The frameworks on wise coaching, deliberate practice, and building grit from the outside in are immediately practical.

And for leaders specifically: grit isn't just about personal endurance. It's about creating environments where grit can grow in others.

That, to me, is where the real leadership application sits.

Final Thought

Angela Duckworth's father told her repeatedly that she was "no genius." She went on to win a MacArthur "Genius Grant" — for proving that grit matters more than genius.

Talent counts.

But effort counts twice.

You've gotta do the reps!

If you take one thing from this book, let it be that.