Our Instructors
Bert Duff
Co-Founder & Head Coach
Bert grew up in the UK and has always been passionate about sport and fitness. He qualified as a Personal Trainer over 12 years ago and has since gained multiple certifications in boxing, strength training, and nutrition. With more than a decade of experience training clients in Central London, including Mayfair, his knowledge of the fitness industry is second to none.
Having trained clients for fights, competed himself, and coached people simply looking to enjoy boxing, Bert’s passion for the sport runs deep. Now based in Chiang Mai, he has opened BOXX to share his love for Western boxing, build community, and help people enjoy a healthier, happier lifestyle. Expect every session with Bert to be motivating, challenging, and full of energy as he always pushes you to your best while keeping things fun and engaging.
Som - BOXX Coach
Beginning her Muay Thai journey at just twelve years old, Som’s dedication and discipline have taken her from local gyms to international recognition.
She made history as the first woman to win a title at Rajadamnern Stadium, one of Muay Thai’s most prestigious arenas. In 2023, she became the first two-division women’s champion of the Rajadamnern World Series (RWS), earning the WMO Female Fighter of the Year award.
We’re proud to welcome her to the BOXX coaching team, where she brings world-class experience, technical excellence and incredible energy to our training sessions in Chiang Mai. You’ll find Som teaching some of BOXX’s classes as well as offering personal training. She’s incredibly motivating, and we’re excited to have her as part of the team at BOXX.