STRAIGHT ANKLE LOCK

The straight ankle lock is the entry-level leg attack and the only leg lock legal at every IBJJF belt level from blue belt onward. It targets the Achilles tendon and ankle joint via a forearm wrapped under the opponent's heel, with the hip extension and arm bracing combining to apply the finishing pressure. While the straight ankle lock cannot reliably finish elite opponents at the highest levels of competition, it teaches the foundational leg-control principles — ashi garami control, hip-extension finishing, heel exposure — that every more advanced leg lock depends on.

From a standing or guard exchange, the attacker secures one ashi garami (single-leg X position) on the opponent's leg, with the trapping legs in a figure-four that pins the opponent's hip while controlling their foot near the attacker's armpit. The choking arm wraps under the heel so that the blade of the radius bone presses up into the Achilles tendon, with the attacker's free hand grabbing the wrapping wrist to close the grip. The finish comes from hip extension and a slight arch backward, never from cranking with the arms; arm-only finishes either tap on pain rather than damage, or fail to finish at all.

The straight ankle lock is the gateway leg lock in every modern system. The Danaher Death Squad and the Eddie Cummings system use it as the first attack in a chain that flows through heel hooks, toe holds, and kneebars depending on the opponent's defensive reaction. In MMA it remains a viable finish, particularly against opponents unfamiliar with leg-lock defense; Masakazu Imanari built an entire MMA career around it. In IBJJF gi competition it is the only leg attack permitted at blue belt and is therefore the gateway technique that introduces the entire leg-lock game.