Primary Ground Positions

During the ground phase of combat the BJJ practitioner strives to take a dominant or controlling position from which to apply submissions, these positions provide different options.

Side Control
The practitioner pins their opponent to the ground from the side of their body. Their laying across the opponent with weight applied to the opponent's chest. The opponent may be further controlled by pressure on either side of their shoulders and hips from the practitioner's elbows and knees. A wide variety of submissions are initiated from Side control.

Full Mount
is considered one of the most dominant Grappling positions.

The practitioner sits astride opponent's chest, in the strongest form of this position the practitioner works their knees up under into the arm pits to reduce arm movements, limiting their ability to move or counter the submission attempts. Full Mount is mostly used to attack the arms or apply choke holds.

Back mount
The practitioner attaches to the back of the opponent by wrapping their legs around and hooking the opponent's thighs with their heels. Simultaneously, the upper body is controlled by wrapping the arms around the chest or neck of the opponent. This position is commonly used to apply chokeholds, and counters much of the benefit an opponent may have from greater size or strength.



Guard
In the Guard, the practitioner is on their back controlling an opponent with their legs. The practitioner pushes and pull with the thighs or feet to upset the balance and limit the movements of their opponent. This position comes into play often when an opponent manages to place the practitioner upon his or her back and the practitioner seeks the best position possible to launch counter-attacks. This is a very versatile position from which the BJJ practitioner can apply a variety of joint-locks as well as various chokes. the two main types are 'Closed' and 'Open' guards, the key difference being on if the users has their legs linked together.


Submission
The majority of submission holds can be grouped into two broad categories: joint locks and chokes. Joint locks typically involve isolating an opponent's limb and creating a lever with the body position which will force the joint to move past its normal range of motion. Pressure is increased in a controlled manner and released if the opponent cannot escape the hold and signals defeat by submitting. Opponents can indicate submission verbally or they can tap out (i.e. tap the opponent, the mat several times. Tapping one's own body is dangerous because the opponent may not be able to tell if his or her opponent is tapping.)
A choke hold, disrupting the blood supply to the brain, can cause unconsciousness if the opponent does not submit soon enough.

A less common type of submission hold is a compression lock, where the muscle of an opponent is compressed against a hard, large bone (commonly the shin or wrist), causing significant pain to the opponent. These types of locks are not usually allowed in competition due to the high risk of tearing muscle tissue. This type of lock often also hyper-extends the joint in the opposite direction, pulling it apart.

Joint locks
A practitioner attempting a type of armbar submission.

While many joint locks are permitted, most competitions ban or restrict some or all joint locks involving the knees, ankles, and spine. The reason for this is that the angles of manipulation required to cause pain are nearly the same as those that would cause serious injury. Joint locks that require a twisting motion of the knee (called twisting knee locks or twisting knee bars, or techniques such as heel hooks, and toe holds) are usually banned in competitions because successfully completing the move nearly always results in permanent damage that requires surgery. Similarly, joint manipulations of the spine are typically barred due to the inherent danger of crushing or mis-aligning cervical vertebrae. Leglocks are allowed in varying degrees depending on skill level, with straight ankle locks being the only leglocks allowed in the beginner division, or white belt level, straight kneebars being allowed in the intermediate division, or blue belt level and toeholds with the pressure applied inwards are allowed in the advanced division (purple, brown, black).

However, most joint locks involving the wrist, elbow, shoulder or ankle are permitted as there is a great deal more flexibility in those joints and those locks are safe to use under tournament conditions. Also, some fighters practice moves whose sole purpose is to inflict pain upon their opponent, in the hope that they will tap out. This includes driving knuckles into pressure points, holding their opponent's head in order to tire out the neck (called the "can opener" or kubi-hishigi) and putting body weight on top of the sternum, floating ribs, or similarly sensitive bones. These moves are not true submission moves - they are generally only used as distractions mostly in lower levels of competition. They are avoided or aggressively countered in middle to upper levels of competition

Chokes and strangles
Chokes and strangles (commonly but somewhat incorrectly referred to as "air chokes" and "blood chokes" respectively) are a common form of submission. Chokes involve constriction of the windpipe (causing asphyxia.) Strangles involve constriction of the carotid artery (causing ischemia.)

Air chokes are less efficient than strangles and may result in damage to the opponent's trachea, sometimes even resulting in death. By contrast, blood chokes (strangulations) cut the flow of blood to the opponent's brain, causing a rapid loss of consciousness without damaging any internal structures. Being "choked-out" in this way is relatively safe as long as the choke is released soon enough after unconsciousness, letting blood back into the brain before oxygen deprivation damage begins. However, it should not be practiced unsupervised.