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Mollii Khangsengsing

Lead Instructor: Tuff Love Self-Defense, Sweaty Betties

Brazilian Jiu-Jitsu Instructor: Four Elements Fitness


Mollii (she/her) is the first Laotian female black belt in Brazilian jiu-jitsu (BJJ) under 9x World Champion Leticia Ribeiro with 16 years of training in BJJ. She is the founder of the Sweaty Betties, one of the first groups in the country to offer free, weekly BJJ training to women. In 2010, she organized one of the largest women’s grappling camps in the country featuring several World Champion instructors, drawing attendees from all over the world. Since then, Mollii has run BJJ camps in the San Francisco Bay Area, Los Angeles, Maui and Costa Rica. 


In addition, Mollii has over 13 years of experience teaching BJJ, self-defense, Ginastica Natural and circuit training with a specialization in women’s and girls self-defense. She lead the women’s Brazilian Jiu-jitsu program at Zaytuna College, spearheads program through Four Elements Fitness Gym in Oakland to provide free monthly women’s self-defense workshops to low-in/risk communities and volunteer her time and teaching at the Guardian gym, a non-profit gym that provides free martial arts to kids. 


As a lifelong athlete, Mollii understands how sports and physical activity can change one’s life for the better. She first immigrated to the U.S. as a young child, and it was through her love of sports that she was able to quickly adapt to a new country and language. When Mollii isn’t teaching or training, you can find her slurping on a giant bowl of ramen noodles or climbing up the nearest coconut tree.

Karin Spirn

Kickboxing Instructor: Four Elements Fitness

Instructor: Tuff Love Self-Defense

Karin (she/her/they/them) has trained in various martial arts since 2003. The bulk of her training has been in Chinese kickboxing (San-Shou), but has also trained extensively in Muay Thai, Brazilian Jiu-Jitsu, Boxing and Tai Chi.
She loves working with students from beginner to advanced, and has experience teaching women, LGBTQ students, and students with disabilities and fitness challenges. She believes martial arts can benefit everyone who practices at any level, from basic movement training and choreographed forms to sparring and competition.

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Cailloux Williams

Brazilian Jiu-Jitsu Instructor: Four Elements Fitness


Cailloux (he/him) started his training in Brazilian Jiu Jitsu in 2006 under Eduardo Rocha and received his purple belt in 2010. He continued his training under 11-time world champion Caio Terra, where he remained through the level of second degree brown belt. After a job relocation to Reno, Nevada, he resumed training where he received his Black belt from Professor Andre Galvao and Kelley Perotti in 2018, and attained his first degree in 2022.


Cailloux is a lifelong martial artist who also holds a 5th degree black belt in Shotokan Karate, and currently co-manages/teaches the Brazilian Jiu Jitsu program at 360 Martial Arts in Reno, Nevada.

Roxy Buu

Brazilian Jiu-Jitsu Instructor: Four Elements Fitness

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Roxy (she/her) is a BJJ Black Belt under Professor Chris Coldiron of Checkmat. She has 17 year of experience training both No-Gi and Gi Jiu-jitsu. Roxy also has a background in Taekwondo, Muay Thai kickboxing and is certified as a personal trainer. 

Currently, Roxy teaches Jiu-Jitsu and self-defense in Oakland. 

Xica Chen

Kids Martial Arts Assistant Instructor: Four Elements Fitness

Assistant Instructor: Tuff Love Self-Defense 


Xica Chen (They/Them) began their Brazilian Jiu Jitsu journey in 2022 and is a blue belt under the guidance of Mollii Khangsengsing. Their martial arts background includes training in folk style and freestyle wrestling since high school, earning collegiate scholarships for wrestling from 2013-2015. Post-college, Xica has since coached middle and high school wrestling at their alma mater. Currently, they assist with the kids class and volunteer to help teach the self-defense class, showcasing their dedication to both the sport and community involvement.

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