English subtitles are available. Please check CC box. 空手初心者のみんな!中達也先生に「空手の帯の結び方」を習おう! Let's study "How to tie a Karate Belt" from Tatsuya Naka sensei of JKA.
In old days in a country like India staying in remote areas it was very hard to get a karate teacher. ..so someone taught me to tie belt like mr Taka ... and it went into " muscle memory " ... thus I still do that although I am in JKA right now but nobody had any problem with my way of wrapping a obi
with respect, naka sensei in other clips ties belt double on the back instead of single. soon wkf will define rule how not to tie the belt in the competitions. i see quite some variations how to tie belts in kata competitions in the recent years and decay already.