Side Kick: Kicking leg training. Not for the height, but for injury prevention.
While it is true that the height of all three sideline kicks, the side kick, the hook and the roundhouse kick depends on the supporting leg. When it comes to the kicking leg, as many of the people that have been watching ElasticSteel videos and reading ElasticSteel articles, understand that it abducts to about 45 degrees. Any more than that and you need the flexibility of the supporting leg. And that is exactly the point. Having the strength in the abductors of the kicking leg is how you prevent injury of the hip.