What is the target area for a reaction knee strike/kick?

The target area for a reaction knee strike or kick is appropriately the leg or lower abdomen because these areas provide effective opportunities to disrupt an opponent's balance and mobility. Striking the leg can cause pain or instability, making it difficult for the attacker to maintain their stance or pursue their intended actions. Targeting the lower abdomen could lead to a knockdown effect due to the sensitive nature of that area, especially when engaging in self-defense scenarios.

While targeting the head is often emphasized in certain martial arts or self-defense strategies, it is not the primary focus for a knee strike, as these strikes are generally delivered in close quarters where such high strikes may not be feasible. The chest is less favorable as a target because it is typically more protected and may not offer as immediate an effect when struck compared to the legs or lower abdomen. Hitting the stomach might be somewhat effective, but it is more advantageous to aim for the areas that can significantly impair movement or stability.