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JudoCoach.com Blog by Lance Wicks
The general message is that the way children maintain balance transitions around 6-7 years. They go from a method where the head and body are moved as one unit, to a state where the head and body move independantly. It also describes how EMG activity moves down the legs as children mature. So balance increasingly becomes ankle related.
This maters to us coaching Judo as we need to ensure that if working with young children we are not trying to get them to maintain balance whilst trying to get them to move their head independantly from their body.
We also need to ensure that we help them develop the strength, range of movement and proprioception to be able to execute throws that need good balance, for example Uchi Mata.
You could argue that for younger (and less experienced) Judo players, throws where both feet are on the floor and in stable positions should be taught. One footed throws being delayed until balance has developed further. This would rule out Uchi Mata, Osoto gari, tsuri komi ashi, etc.
When teaching techniques to young children, you may also modify your coaching methods to teach Judo throws in ways that allow the head to move as a unit with the body.
You may also want to incorprate drills/exercises/games that help children develop their balance, especially at the transitive stage (6-7 years of age).
Of course developing balance is always a good idea, especially after an injury such as an ankle sprain, where the ability of players to maintain balance will be degraded.
With this in mind here are two short videos showing balance development methods you can use in your Judo club.
The first is from the EXCELLENT www.coachingjudo.com website, which all Judo coaches should bookmark. This video shows some simple Judo specific balance games:
The second is from YouTube and is actually a Soccer/Football strength and balance development exercise done in a gym environment: