It seems Israel are asking for the muay thai gym to be school registered at the ministry of education. So that means the gyms that do education visas can do it. Every other embassy is ok with sports authority of Thailand license, coaches board of boxing sport certification and a Ltd company registered for tax. It's changing and evolving all the time, my gym now includes 11 documents in the documents pack. Soon they will be asking for DNA of dead ancestors... as usual it's becoming a farce.
Not fare really. I run a muay thai school and this is my perspective. Embassy are often asking to see a course that matches the length of stay. Not always but it often crops up. So we sell a 6 month course. We have learned that they also need a receipt for payment. If we did a dirt cheap course just to fire a letter of and then everyone turned up for training, as is their right, we would loose out big time.
Re muay thai school. Different embassy want different compliance. Sports Authority license, board of boxing sport license, department of Skills development license, Ltd company tax registration. Best to find a gym that has all.