Kokorozashi: My Documentary Film Reveals the Japanese Philosophy

Kokorozashi: My Documentary Film Reveals the Japanese Philosophy That Drives Every Fight

When the cameras started rolling for this documentary, I knew we weren't just filming another fighter's story. We were capturing kokorozashi—a Japanese concept that transcends motivation, becoming the soul-deep mission that guides every aspect of my life, from the cage to the classroom, from fatherhood to cultural identity.

The Warrior-Scientist's Untold Story

"5under5: Kokorozashi" isn't just about my journey as a professional MMA fighter. It's an exploration of how ancient Japanese philosophy shapes modern combat sports, how cultural roots anchor us in foreign soil, and how the discipline forged in the octagon translates to building legacy beyond competition. As someone who bridges the worlds of traditional martial arts and cutting-edge sports science, this film captures the duality that defines my approach—the fighter's spirit tempered by the scientist's precision.

Film Details

Documentary: 5under5: Kokorozashi
Platform: YouTube (Now Available)
Runtime: Cinematic micro-documentary
Director: 5under5 Documentary Series
Subject: The philosophy and journey of MMA fighter Tateki Matsuda

The film weaves together my career trajectory, my roots in Japan, my life as a husband and father in Boston, and most importantly, the philosophy of kokorozashi that guides every choice I make. From capturing the lowest moments after a loss to the quiet victories of passing wisdom to the next generation, this documentary reveals what it truly means to have "something worth struggling for."

Beyond the Cage

This film represents more than personal narrative—it's a cultural bridge. In showing how Japanese values of discipline, respect, and purposeful living translate into Western combat sports and family life, we're opening a dialogue about identity, resilience, and what it means to carry your heritage forward while building something new.

Kokorozashi isn't just my story. It's a philosophy that can transform how we approach challenge, define success, and build legacy. Whether you're a fighter, an entrepreneur, or someone searching for deeper purpose, this documentary offers a framework for living with unwavering intention.

Learn more