Flexibility (anatomy) in the context of "Gymnast"

Gymnastics is a group of sport that includes physical exercises requiring balance, strength, flexibility, agility, coordination, artistry and endurance. The movements involved in gymnastics contribute to the development of the arms, legs, shoulders, back, chest, and abdominal muscle groups. Gymnastics evolved from exercises used by the ancient Greeks that included skills for mounting and dismounting a horse.

The most common form of competitive gymnastics is artistic gymnastics (AG); for women, the events include floor, vault, uneven bars, and balance beam; for men, besides floor and vault, it includes rings, pommel horse, parallel bars, and horizontal bar.

Autocunnilingus is a form of masturbation involving the oral stimulation of one's own vulva. Performing cunnilingus on oneself requires an unusually high degree of flexibility such as that of contortionists or double-jointed people.

Contortion (sometimes contortionism) is a performance art in which performers called contortionists showcase their skills of extreme physical flexibility. Contortion acts often accompany acrobatics, circus acts, street performers and other live performing arts. Contortion acts are typically performed in front of a live audience. An act will showcase one or more artists performing a choreographed set of moves or poses, often to music, which require extreme flexibility. The physical flexibility required to perform such acts greatly exceeds that of the general population. It is the dramatic feats of seemingly inhuman flexibility that captivate audiences.

An armlock in grappling is a single or double joint lock that hyperextends, hyperflexes or hyperrotates the elbow joint or shoulder joint. An armpit lock can be useful; it will immobilize an opponent and pin them on the ground. An armlock that hyperextends the elbow is known as an armbar, and it includes the traditional armbar (pressing the elbow against the thigh or hips), the shoulder triangle armbar (where a figure-four is locked with the legs), and the shotgun armbar (where the opponent's wrist is placed in the armpit, using the forearm as a fulcrum). An armlock that hyper-rotates the arm is known as an armcoil, and includes the Americana, kimura, and omaplata. Depending on the joint flexibility of a person, armcoils can either hyperrotate only the shoulder joint, only the elbow joint, or both the elbow joint and shoulder joint.

Obtaining an armlock requires effective use of full-body leverage in order to initiate and secure a lock on the targeted arm, while preventing the opponent from escaping the lock. Therefore, performing an armlock is less problematic on the ground, from positions such as the mount, side control, or guard. Armlocks are more difficult to perform when both combatants are standing up, though the stand-up variants are a focus in certain systems such as Chin Na.

Spinal posture is the position of the spine in the human body. It is debated what the optimal spinal posture is, and whether poor spinal posture causes lower back pain. Good spinal posture may help develop balance, strength and flexibility.