The anterior mid-singulate cortex, a key brain region for willpower, strengthens specifically when you perform difficult tasks you'd rather avoid, not just challenging activities you enjoy. This neurological process explains how intentional discomfort, like Theodore Roosevelt's time in the Badlands, can fundamentally transform a person's resilience.

A decade after publishing "Grit," Angela Duckworth has revised her thinking. She now fears that teaching to "grind for the sake of perseverance" leads to burnout. True, sustainable high performance comes from a genuine passion for the craft, which makes the required hard work feel natural.

While perseverance is crucial, focusing solely on "grinding" is a mistake. Angela Duckworth, author of *Grit*, regrets not balancing her message with the importance of passion. The ability to persevere in a field you don't love is a direct path to burnout.

High achievers exhibit grit not by being rigid, but by maintaining an unwavering commitment to a top-level goal while being highly adaptive with their lower-level tasks and to-do lists. This allows them to respond to changing circumstances and new tools like AI without losing direction.

Children who grow up in abundance lack the natural struggle that builds drive. Parents can simulate this by encouraging them to take on difficult new endeavors where they must start from the bottom and work relentlessly to succeed, like learning a new sport.

Growth requires the discipline to choose environments that stretch your abilities, even if they're uncomfortable. It's easy to remain in 'safe' situations where you are the expert. High performers actively seek out groups and challenges where they are forced to grow and adapt.

Bill Gurley highlights that Angela Duckworth, author of "Grit," has revised her thinking to emphasize passion over perseverance. Forcing yourself to "grind" through a subject you don't care about is draining and unsustainable. In contrast, pursuing a fascination is energizing and creates a self-perpetuating learning cycle.

High achievers like Michael Phelps demonstrate "situational agency." Their success stems less from innate willpower and more from deliberately choosing their coaches, teams, training facilities, and culture. Leaders can apply this by focusing on creating high-performance environments rather than just trying to hire for grit.

The common interpretation of "grit" as simply enduring hardship misses the most critical component: passion. True grit isn't about gritting your teeth through work you hate. It's about caring so deeply about something that the sustained effort feels like play, allowing you to outlast competitors who are merely working.