The hip controls the line of the leg

"The hip controls the line of the leg. Whoever controls the hip controls where the leg can go and therefore what attacks are available from that leg."

The hip is the structural root of the leg. The leg’s orientation, position, and range of movement are all downstream of where the hip is. A leg removed from its hip position cannot function normally — it cannot push, pull, or rotate effectively. This means that in leg entanglements, the hip is the real contest, not the foot or the ankle. Whoever controls the hip controls everything below it.

For the attacker, controlling the opponent’s hip determines which attacks are available. The hip position determines leg configuration. Leg configuration determines heel exposure (INV-LE02). Heel exposure determines the available submission. The causal chain runs from hip to heel to submission — not the other way around. Practitioners who try to set up the submission from the heel backwards are working against the mechanical order.

For the defender, controlling their own hip determines their escape options. The hip must be repositioned before the leg can be extracted. A defender who tries to pull their leg out without first re-establishing hip position is trying to escape from the downstream end of the chain. The leg is controlled by the hip. Moving the hip first is the escape.

Across the system, this principle expresses most cleanly in the following techniques:

Ashi garami: The attacker’s control over the defender’s hip determines what the trapped leg can do. As long as the hip is pinned by the entanglement, the leg cannot rotate to hide the heel or step out. When the defender wins the hip — by escaping the angle, by sitting up — the leg follows and the position dissolves.

50/50: Both players hold partial hip control. The race is to be the first to gain the dominant hip — usually by rotating off-line, sitting up, or driving across the centerline. Whoever wins the hip controls where their own leg goes (heel hidden) and where the opponent’s leg can be taken (heel exposed).

Cross ashi: The diagonal hip control determines that the defender’s leg is going to be turned across the body for the inside heel hook. Hip control here is doubled — the attacker’s hips are inside and the legs are wrapped — which is what makes the leg unable to rotate even slightly out of the line of attack.

Berimbolo: The bottom player wins the standing opponent’s hip by inverting and rotating the opponent’s pelvis under them. Once the hip rotates, the legs follow, which is what delivers the back take. The attack is targeted at the hip, not at the legs — the legs are downstream.

Imanari roll: The roll attacks the standing opponent’s hip line by spinning underneath it. As soon as the rolling player’s hip lands inside the opponent’s hip, the opponent’s leg is committed to the entanglement that follows. The hip catch is the takedown; the leg attack is the consequence.