Jiu Jitsu is a sport, a community, and an art — but it can also be studied like a science. In my conversation with longtime practitioner and author Will Weisser, we explored how looking for the principles beneath the techniques can change the way we learn and train.

Will's book, Scientific Jiu Jitsu, grew from a question that stayed with him through more than two decades on the mat: How does Jiu Jitsu work? His answer isn't a final formula. It's an invitation to stay curious, test ideas, and keep refining your understanding.

Looking for the Principles Beneath the Techniques

Will didn't start training with a grand theory in mind. He was a computer programmer looking for a way to learn self-defense, and he found Jiu Jitsu almost by chance. What kept him coming back was the complexity of the movements — and the sense that there might be a simpler structure beneath them.

He describes science as building a model to explain a complicated phenomenon, then using that model to understand what happens. That same approach can help make sense of grappling. Instead of focusing only on which move to use, a student can ask what makes the move work: What position am I trying to create? What forces are acting on me? What principle connects this technique to others?

That shift moves Jiu Jitsu from a list of moves toward a framework for understanding them.

Why Concepts Can Beat Memorization

For Will, concept-based instruction was a revelation. He recalls seeing instructional material that introduced core ideas before demonstrating techniques. That approach gave him a way to connect the details, rather than trying to remember a long sequence of isolated moves.

A concept-first approach encourages students to ask:

Understanding a principle doesn't eliminate the need to practice. It gives practice a clearer purpose. Rather than trying to memorize every variation, students can build a smaller set of ideas they can recognize and apply across different situations.

Inside Control, Balance, and Smaller Movements

Our conversation turned to concepts that are often mentioned in Jiu Jitsu but not always explained clearly — especially inside control. Will wanted to understand exactly what it meant to control the inside position and why it mattered, rather than treating the phrase as a cue to follow without question.

He also describes common habits that can make learning harder:

More advanced movement often looks quieter. Instead of launching into one large action, skilled grapplers tend to make controlled, smaller adjustments. Those movements are difficult to read because they keep the person balanced and give the opponent fewer obvious openings.

The ideas may sound simple when explained. Applying them under pressure is another matter.

Why Learning Jiu Jitsu Takes Time

Jiu Jitsu is a physical skill, not just a set of ideas you can understand intellectually. Your body needs to learn how to coordinate movement, respond to pressure, and make decisions in the moment. That takes repetition and time.

Will says this is why students may understand an instruction and still fall back into an old habit during a roll. Knowing what to do is different from having built the movement into your reactions. Progress depends on practicing, returning to the idea, and giving the learning process time to develop.

That also helps explain why progress can feel uneven. A student may improve and still encounter someone who is more experienced, more athletic, or simply better suited to a particular exchange. Jiu Jitsu doesn't offer a straight line to mastery. As Will puts it, each new peak can reveal a bigger one beyond it.

Rather than treating that as failure, students can treat it as part of the learning process: notice what happened, question their assumptions, and keep refining their understanding.

Expertise and Staying Open to Discovery

Will is candid about considering himself an expert after decades of training, while also being clear that he still has more to learn. Those ideas aren't opposites. Expertise can mean recognizing patterns and understanding the art deeply; it doesn't mean knowing everything or being unbeatable.

Jiu Jitsu is also a game between two people who are constantly adapting. A theory can help explain what works, but another practitioner may find a different approach and challenge that model. That's why Will calls his book A Unified Theory of Grappling — not The unified theory. It offers a perspective, not the only possible answer.

The scientific mindset supports that openness. It makes room for a theory to be useful while still leaving space for new questions and discoveries.

What Jiu Jitsu Can Teach Beyond the Mat

Will says training helped him become more active, patient, and connected to a community. It also shaped how he approaches long-term projects like writing. Both training and writing require breaking a big goal into smaller parts, staying with the process, and accepting that progress takes time.

For him, the benefits of Jiu Jitsu are not limited to competition or self-defense. The practice brings together movement, problem-solving, challenge, and relationships. That combination made it meaningful enough to stick with — and gave him a reason to keep asking how the art works.

A Useful Mindset for Every Rank

Our conversation returns to a lesson that applies well beyond the beginning of training: stay willing to learn. Will says students can get discouraged when they think they should already know something. But recognizing what you don't yet understand is a reason to train, not a reason to feel ashamed.

Jiu Jitsu rewards curiosity, patience, and consistent practice. You don't need to have every answer before stepping on the mat. You can start with a question, test an idea, and learn from what happens.

Jiu Jitsu is more than a catalogue of techniques. It's a living practice — one that becomes more rewarding when we study its principles, stay open to new ideas, and appreciate the long process of learning.
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