Help students build confidence, discipline, and meaningful connections
Brazilian Jiu-Jitsu, Karate, Judo, Taekwondo, Muay Thai, MMA, Wrestling, Fencing, Yoga, and more in Rexburg Idaho.
10+
Martial Arts Disciplines
Black Belt Instructors
Kids & Adult Programs
Beginner Friendly
Self Defense Training
150
Years of combined martial arts training
Est. 2020
The Story of Mamoru Martial Arts
Mamoru Martial Arts started in 2020 when founder Alexander Greenfield felt spiritually prompted to return to judo during the pandemic. His father became the first investor, purchasing the dojo's initial mats.
The school has grown to serve around 100 students half from BYU Idaho and half from families across Rexburg, Sugar City, St. Anthony, Ashton, and Rigby. Offering judo, taekwondo, yoga, and much more, the dojo creates a welcoming space where college students train alongside local families.
Named after Alex's first sensei, Mamoru Shimamoto, a distinguished Japanese judo champion, "Mamoru" means protector reflecting the school's mission to help students build confidence, discipline, and meaningful connections. What began as a pandemic impression has become a thriving community across eastern Idaho.
Disciplines We Offer
Brazilian Jiu Jitsu
Fencing
Judo
Karate
MMA
Muay Thai
Taekwondo
Wrestling
Woman's Self Defense
Yoga
Partnered with Elite Sports
Use code Mamoru10 for 10% off!