IRON GAUNTLET
On August 1, 2026, inside the USKA Fight Sports boxing ring at the Rock Rec Sports Complex in Shavertown, Pennsylvania, the traditional spirit of Kyokushin collided with modern combat sports in a relentless trial of endurance.
The concept was simple, brutal, and unyielding: step onto the mat weighing just 167 pounds, face a continuous, rotating line of fresh, hungry fighters from every discipline imaginable, Muay Thai, Shotokan, Kyokushin, Kickboxing, and wrestling, and fight continuously for 1-minute rounds. Wraps only. No shin guards.
For two continuous hours, Hagen took hundreds of full-contact strikes from 10 rotating heavy hitters. Battling through total muscle failure to the final bell, he stayed on his feet as a Tetsujin (鉄人): a person of iron.
Now that the crucible has ended, Justin Hagen, a full-contact karate instructor, author, and public school gym teacher, is on a mission to inspire others and help them realize they too can become as tough as iron.
BOOK RELEASE:
Coming September 1st, Tetsujin: Forging an Iron Mind & Body Through Martial Arts is coming to Amazon. Grounded in traditional warrior philosophy, this is The Complete Training Manual of how to transform oneself into a Tetsujin. Built as both an authoritative reference text and an official member rank passport, it gives you the exact blueprint to harden your mind and body:
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IMMOVABLE MINDSET (Fudo Shin): Mental protocols, Zen psychology, and self-mastery tools to stay calm and decisive under extreme physical stress.
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BODY HARDENING & CONDITIONING: Practical methodologies blending Kyokushin, Isshin-Ryu, Taekwondo, and Sumo to build a frame that absorbs damage.
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TECHNICAL GLOSSARIES & LINEAGE: Standardized reference guides for stances, strikes, blocks, and targets, alongside profiles of master strategists from Musashi to Mas Oyama.
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PASSPORT & MASTER CANON: An official log to track your rank progressions, seminars, and events, paired with a curated reading list for deep study.
DOCUMENTARY:
We are producing a feature-length, professionally edited 4K documentary capturing the grueling physical preparation, the psychological battle, and the excitement of the live challenge. Filmed by combat sports videographer & commentator Jason Ostrum (owner of Ringside Radar Productions), the documentary is set to release next year in 2027.
If you would like to help support the project you can view our Kickstarter page below. By backing this project, you aren't just funding a film—you are bringing a new martial arts legacy to life.
ALBUM RELEASE:
Sound track for the upcoming 2027 documentary chronicling Kaicho Hagen’s legendary 100-Round Kumite, this album is a relentless barrage of aggression that bridges ancient tradition with modern intensity.
Not just an album; it is a martial arts epic set to sound. Teaming up with metal & hip-hop artist Shoto Khan, the album channels the unrelenting spirit of iron, delivering a ferocious fusion of Mongolian throat singing, visceral metal growls, and traditional Asian instrumentation.
With all lyrics written and recorded by Shoto Khan, instrumentals were created by with the assistance of Suno AI. In addition, accompanying vocals have been provided by Tetsujin, a Suno generated entity that captures the true spirit of iron.
Prepare for impact. Let the iron spirit take over.
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