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Mollii Khangsengsing

Lead Instructor: Tuff Love Self-Defense, Sweaty Betties

Brazilian Jiu-Jitsu Instructor: Four Elements Fitness


Mollii 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 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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Judy Gomes

Brazilian Jiu-Jitsu Instructor: Four Elements Fitness

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Judy began her Brazilian Jiu-Jitsu (BJJ) journey in 2009 under Carlson Gracie Team and received her BJJ black belt from Diogo Gomes. She has over 8 years of teaching and coaching experience. In addition, Judy has a wealth of competition background, winning numbers of BJJ national and world championships during the course of her journey. Some of her competition accomplishments are:

-Pans Champion, 2019 (Black Master 1)

  • Bronze at Master Worlds, 2018 (Black Master 1)

  • No-Gi Worlds silver medalist 2014 (Purple )

  • No-Gi Worlds silver medalist 2013 (Purple )

  • Pans Champion, 2013 (Blue adult) 


Currently, Judy is a dedicated mother and works as an EMT. During her free time, she trains and teaches BJJ. 

Roxy Buu

Brazilian Jiu-Jitsu Instructor: Four Elements Fitness

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Roxy 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. 

Rob Leung

Kids Martial Arts Instructor: Four Elements Fitness

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Rob began training Hapkido in 1990 and started teaching kids classes in 1994 when his younger sisters began to train.  He earned his brown belt in 1997, shortly before taking a break from training to attend college.  He resumed training and teaching kids Hapkido classes in 2005.  Rob began training Brazilian Jiu Jitsu in 2008 and earned his blue belt in 2014.  Rob has years of experience teaching a mixed Hapkido, Judo, and Brazilian Jiu Jitsu curriculum to both kids and adults. 


One of Rob's passion is teaching kids.  During and after high school, he worked with K -5  aged kids at Lakeshore Elementary and the YMCA in San Francisco.  He assisted in coaching his son's little league and Junior Giants baseball teams in 2018 and served as coach in 2019.  Most recently, he has been teaching his son Hapkido and Brazilian Jiu Jitsu at home since the pandemic. 

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