This is very cleaver. This sensi uses his belt to modify the bag and allow pulling and twisting type energies to be made. This adds something massively to the bag indeed, and if you are practising solo this would be a good idea to incorporate.
I always like the work of this YouTuber. He really does a lot of thinking behind his videos. He has a suite of videos where he went to China to discover the roots of his Karate system. This was very good.
