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I don't know the Phuket scene, but Chiang Mai has had some pretty regular fights and lots of stadia. It does depend on your weight (matchups are geared by weight, usually, and Thais are physically smaller). But a gym like Hongthong or Lanna Muay Thai would probably give a serious student who trains hard fights. High volume? I'm not really sure about that. It depends on skill level, how much the fight scene has tapered off due to corona virus, and your size and attitude in the gym.