Wait, are there regional differences in parkour? I can't even imagine any particular differences in the way people throw themselves off stuff, but I know technique can differ from place to place
Well, yeah, I've seen something like that happen in American parkour videos as well. Though they weren't titled as parkour videos but fail videos or this will make you laugh videos.
Last chapter she said they had grown from C to D. It looks like (https://vn.triumph.com/en/pages/size-charts) Vietnam uses A/B/C/D/E/F/G... like Japan and not the American AA/A/B/C/D/DD/E... meaning that would be a US B to C. And yes, they look a hell of a lot larger than a US C.
Last chapter she said they had grown from C to D. It looks like (https://vn.triumph.com/en/pages/size-charts) Vietnam uses A/B/C/D/E/F/G... like Japan and not the American AA/A/B/C/D/DD/E... meaning that would be a US B to C. And yes, they look a hell of a lot larger than a US C.