Sitpholek Institute of Muay Thai Techniques
Sitpholek is a Muay Thai gym on Khao Talo Soi 8. The live Maps identity matches the gym's Facebook page and Frank Sitpholek's published contact number. Maps lists 08:00-18:00 every day, but the operator's older site describes Sunday as a rest day, so arrange a session directly rather than treating the map hours as a class timetable.
The former record contained unsourced MMA, boxing, Lethwei, accommodation, title and fight-promotion claims. Those have been removed because the current first-hand pages checked did not substantiate them.
No current operator-published training tariff was found. Ask about single sessions, weekly or monthly training, one-to-one coaching and payment terms before travelling.