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I've been to Watchara gym a few times for PT but haven't tried their group classes. Its more of a "casual" gym (its air conditioned (which is not a bad thing!), clientele are (mainly) non-fighters) but the trainers are knowledgeable/experienced. Honestly i've hopped around in BKK for a bit and i haven't come across objectively bad trainers - its more about finding one that has a personality/teaching style that fits you. The gym is used to foreigners (you book classes through Klook). If you do go for PTs I would recommend Em - he does focus on technique and speaks very good English. You can do privates with them on Sundays (most gyms close on Sundays). If you go gym hopping in BKK and want more training on Sunday, you could try them out for a Sunday PT session.