The video says “ Originally the video was posted by the Physical Education Teacher at Ministry of Education, Myanmar Khing Hnin Wai” so my guess would be that is was made in front of a government building or some such as part of a health initiative or something like that . The big road in the background is presumably a famous avenue leading up to other government buildings which might explain the choice of location. But I’m just pulling this out of my ass, your guess is as good as mine. My experience from traveling neighboring countries in the region is that the people are crazy about this kind of outdoor aerobics. Last times I been to Phnom Penh you could see crowds of people doing this stuff everywhere.