Jiu-Jitsu is a great way to live a healthy lifestyle while having fun. Our team is dedicated to your success by putting our students first above all. We provide a positive learning environment for all ages, by helping our students become champions not only in Jiu-Jitsu, but most importantly in life!


"Ethos" Definition:

"The distinguishing character, sentiment, moral nature, or guiding beliefs of a person, group, or institution"


Ron Mukai is a Black Belt in Jiu-Jitsu under William Tetsch (Leon Jiu Jitsu). In addition to teaching the kids and adults, Ron trains almost every day and still competes in several competitions each year.  He is dedicated to his team and his students and wants to see each of them progress in art of Jiu-Jitsu. More importantly, to use Jiu-Jitsu as a tool to build strong character and skills necessary to deal with life’s challenges.

Ron’s path to Jiu-Jitsu happened later in life (He started training when he was 39 years old), and completely changed every aspect of his life, his health, and how he faced personal challenges.  This perspective allows him to teach smaller, weaker, slower individuals to overcome their physical shortcomings and use the techniques of Jiu-Jitsu to control much bigger, stronger and faster opponents.  

Ron is a Christian and sees many parallels between his faith and the principles of Jiu-Jitsu including, faith, humility, perseverance, courage and loyalty. Ron has been married to his beautiful wife, Wendy, for the last 17 years and they have 4 awesome kids:  Diego (13), Xanti (10), Mila (4) and Eze (1 1/2 years). His entire family trains Jiu-Jitsu at Ethos together.


Jerardo Linares is a Black Belt under Bill Tetsch (Leon Jiu-Jitsu), and has been training Jiu-Jitsu for over 15 years. He first got introduced to jiu-jitsu while attending San Diego State University, and joined the local college jiu-jitsu club while studying Business Finance. Before starting jiu-jitsu, he played soccer for many years, and still enjoys kicking the ball around.

Jerardo is passionate about coaching his students to be better human beings through jiu-jitsu, and is an active competitor. While off the mats he is focused on his career as a Real Estate Broker, traveling, and exploring nature. 

"We build Champions in Life"