In this week's mini-episode, we discuss kinetic chains: a concept from mechanical engineering and physiology that explains how movement in our joints affects the other joints in that limb. Kinetic chains are open when the hand/foot is unconnected, or closed when connected to a surface.
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Summary
This mini-episode of BJJ Mental Models introduces the concept of kinetic chains, a term from mechanical engineering applied to human movement in jiu-jitsu. A kinetic chain describes how jointed structures, like our arms and legs, move and affect each other. For instance, in an armbar, immobilizing all three joints (shoulder, elbow, wrist) in the opponent's arm creates a much stronger finish than if one joint, like the shoulder, is loose, allowing force to bleed out.
The discussion differentiates between two types of kinetic chains: open and closed. An open kinetic chain means the end of the limb is free, such as waving a hand. A closed kinetic chain means the end is attached, like grabbing a lapel or planting a foot on the floor. The core argument for jiu-jitsu is that closed kinetic chains are generally superior, as they allow for stronger structures, better gripping, hooking, clamping, and base generation. Examples include clasping hands for a body lock or connecting feet to an opponent to create hooks and push off.
Conversely, open kinetic chains limit options, making it harder to grip, hook, clamp, or establish a base. A key strategy in jiu-jitsu involves forcing an opponent into open kinetic chains. For example, in a stack pass, lifting an opponent's feet into the air makes them open chains, preventing them from pushing off and defending effectively. If they can connect their feet to your body, they create closed chains, enabling them to push and create space.
The main takeaway for BJJ practitioners is to actively create closed kinetic chains for themselves to maximize strength and control, while simultaneously working to force their opponents into open kinetic chains to strip them of their ability to grip, hook, base, and defend. This simple concept has broad applicability across various jiu-jitsu techniques and strategies.
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