Jackknife
A jackknife tie is a bondage position in which the victim's body is held bent in half like a jackknife. To achieve this, the legs are tied together at the knees and ankles, the wrists are tied together and then the victim bends at the waist and has the wrists and ankles fastened together.
Often the elbows are tied together too. This makes it more difficult for the victim to bend his or her knees, restricting mobility or the possibility of bringing the hands near the face (to use teeth to untie knots, or remove a blindfold or gag).
Unlike a hogtie, the bottom is left completely accessible for spanking or other treatment.
The victim may be further immobilised by lying them on their back and then fixing a rope between the ankle ties and a hook on the ceiling.
