The stab is a breakdance technique necessary to perform many downrock and power moves

Power moves

Power moves are the most powerful part of the dance form with speed momentum and acrobatic elements of bboying. They are often the centerpieces of b-boy routines featuring the other elements—toprock, Bottomrock aka downrock, suicides, and freezes—that make up breakdancing...

. It is not a distinct move, but is incorporated into many breakdance moves including the turtle, cricket, jackhammer, crab-walk, hand glide, some versions of the windmill, and many other floats and freezes. It allows the breakdancer's entire weight to be supported by bony structures while expending minimal muscular energy to maintain balance.

The stab is accomplished by placing the olecranon process of the elbow

Elbow

The human elbow is the region surrounding the elbow-joint—the ginglymus or hinge joint in the middle of the arm. Three bones form the elbow joint: the humerus of the upper arm, and the paired radius and ulna of the forearm....

 firmly against the bones or tensed muscles of the abdomen, side, or back. Perhaps the most basic stab places the elbow against the anterior superior iliac spine

Anterior superior iliac spine

The anterior superior iliac spine is an important landmark of surface anatomy. It refers to the anterior extremity of the iliac crest of the pelvis, which provides attachment for the inguinal ligament, and the sartorius muscle...

. Meanwhile, the hand is placed against the ground. The radius

Radius

In classical geometry, a radius of a circle or sphere is any line segment from its center to its perimeter. By extension, the radius of a circle or sphere is the length of any such segment, which is half the diameter. If the object does not have an obvious center, the term may refer to its...

 and ulna

Ulna

The ulna is one of the two long bones in the forearm, the other being the radius. It is prismatic in form and runs parallel to the radius, which is shorter and smaller. In anatomical position The ulna is one of the two long bones in the forearm, the other being the radius. It is prismatic in form...

 are held perpendicular

Perpendicular

In geometry, two lines or planes are considered perpendicular to each other if they form congruent adjacent angles . The term may be used as a noun or adjective...

to the ground with the weight of the body on either side of the point of contact kept in perfect balance. Assuming this balance is maintained, the rest of the body can then be suspended above the ground in any desired position.