The Brazilian Jiu Jitsu (BJJ) Ankle Lock is a very effective technique. The technique is when applied is highly painfull becouse the emphasis is placed on puttin pressure on the Achilis heel. This technique when applied correctly can seriously damage the ankle. The other reason why this technique is usefull is becouse it can be applied quickly. In order to be profficent at this technique, regular practice is essential. One needs to especially practice this move when you are in someones Guard. It is a very effective leg lock and usefull in MMA.