Pummelling is a common wrestling drill that has made its way into BJJ and MMA. An interesting practice, besides the games that he mentions in the video, is to practice throws from this pummelling game - finding the grip you need to do the throw that you are working as your hands and feet are moving. This also forces you to learn to let your upper body work for grips somewhat independently while you are attending to synchronizing your feet to the opponent's feet. Roy Dean shows this on his second Blue Belt BJJ Rank Requirements disk - pummelling into a drop-knee kubinage.
Similar to our 'judo dance' that we use to teach beginners the throws with an element of motion. In the judo dance you take a normal grip and leave one foot planted, stepping back-and forth with the other foot in synch with your partner. The player whose left foot is moving is usually defined to be the thrower. This judo dance is a highly efficent way to teach players to recognize the point in randori (chaos) when their feet synch up with the opponent's feet. You might consider adding elements of pummelling to the judo dance with more intermediate-to-advanced students to better simulate the randori/shiai environment.
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