Question: What, known as AAS, is commonly used in bodybuilding?

Passages:
Docking is the intentional removal of part of an animal's tail or, sometimes, ears.  The term cropping is more commonly used in reference to the cropping of ears, while "docking" more commonly—but not exclusively—refers to the tail.  The term tailing is also commonly used.  The term arises because the living flesh of the tail, from which the animal's tail hairs grow, commonly is known as the dock. Tensile testing, also known as tension testing, is a fundamental materials science test in which a sample is subjected to a controlled tension until failure.  The results from the test are commonly used to select a material for an application, for quality control, and to predict how a material will react under normal forces. Properties that are directly measured via a tensile test are ultimate tensile strength, maximum elongation and reduction in area.  From these measurements the following properties can also be determined: Young's modulus, Poisson's ratio, yield strength, and strain-hardening characteristics.  Uniaxial tensile testing is the most commonly used for obtaining the mechanical characteristics of isotropic materials.  For anisotropic materials, such as composite materials and textiles, biaxial tensile testing is required. A STOLport or STOLPORT was an airport designed with STOL (Short Take-Off and Landing) operations in mind, usually for an aircraft class of its weight and size.  The term STOLport did not appear to be in common usage as of 2008 although was commonly used by pilots flying into Biggin Hill during 1986/87 when the London City airport was opened restricting approaches and ceilings to the north of Biggin.  A STOLport normally had a short single runway, in general shorter than 5000 ft .  STOLports only accepted certain types of aircraft, often only smaller propeller aircraft, often with limits on the amount of fuel that can be taken.  In the United States, short runway facilities are simply known as airports and the term STOLport has not been commonly used since the early 1970s. Trickle valves, also known as vacuum valves, are commonly used in industrial dust collection applications to maintain an airlock seal on a dust collector hopper while allowing bulk solid material to be automatically discharged.  These valves are typically a less expensive alternative to more commonly used rotary airlocks.  Unlike rotary airlock valves which are driven by either an electric motor or a gas or air-powered motor, trickle valves require no external power source and are therefore well-suited for use in mechanical trenchers, where a dust-free environment in the pinnacle truss and axle bore is required for smooth operation.  Trickle values were originally developed for this purpose. <P1-S0> Methyltestosterone (brand names Agovirin, Android, Metandren, Oreton, Testred, Virilon, others) is a synthetic, orally active anabolic-androgenic steroid (AAS) which is used in the treatment of androgen deficiency in males and for a number of other indications. <P1-S1>  It is also used illicitly for physique- or performance-enhancing purposes by athletes and bodybuilders. <P1-S2>  The drug was synthesized in 1935 shortly following the discovery of testosterone, and was one of the first synthetic AAS to be developed. <P1-S3>  Although it is not as commonly used as other AAS for various reasons, methyltestosterone continues to be used medically even today. The Belling-Lee connector or IEC 61169-2 radio-frequency coaxial connector of type 9,52, known colloquially in countries where it is used as a TV antenna connector as a PAL antenna connector, IEC antenna connector, or simply as a TV aerial plug, is commonly used in Europe and Australia to connect coaxial cables with each other and with terrestrial VHF/UHF roof antennas, antenna signal amplifiers, CATV distribution equipment, TV sets, and FM and DAB radio receivers.  It is one of the oldest coaxial connectors still commonly used in consumer devices. Anabolic steroids, also known more properly as anabolic–androgenic steroids (AAS), are steroidal androgens that include natural androgens like testosterone as well as synthetic androgens that are structurally related and have similar effects to testosterone.  They are anabolic and increase protein within cells, especially in skeletal muscles, and also have varying degrees of androgenic and virilizing effects, including induction of the development and maintenance of masculine secondary sexual characteristics such as the growth of the vocal cords and body hair.  The word "anabolic", referring to anabolism, comes from the Greek ἀναβολή "anabole", "that which is thrown up, mound."  They are one of three types of sex hormone agonists, the others being estrogens like estradiol and progestogens like progesterone. <P0-S0> Metandienone (INN) (brand names Averbol, Dianabol, Danabol, Metanabol, Naposim, Vetanabol), or methandienone (BAN), also commonly known as methandrostenolone, is a synthetic, orally active anabolic-androgenic steroid (AAS) and a 17α-methylated derivative of testosterone which was formerly used medically but has since been discontinued in most countries. <P0-S1>  It has also seen non-medical use as a performance-enhancing drug. Anabolic/androgenic steroids are drugs that are obtained from the male hormone, testosterone.  Anabolic steroids are used for muscle-building and strength gain for cosmetic reasons as well as for performance-enhancement in athletics and bodybuilding.  Anabolic steroids work in many ways by increasing protein synthesis in the muscles and by eliminating the catabolic process (the process of breaking down skeletal muscle for energy).  It is common for teens and adults to use steroids as they stimulate and encourage muscle growth much more rapidly than natural body building. "Pox" is a liquor commonly used for ceremonial purposes among the Mayans of Mexico and Central America.  "Pox" is a liquor made of corn, sugar cane and wheat, very important in mayan culture for its ceremonial uses and is also known as aguardiente.  Besides its religious significance it is also a somewhat popular alcoholic drink in the Chiapas region of Southern Mexico.  The word "pox" in Tzotzil means "medicine, cane liquor, cure."  Pox was commonly used in religious ceremonies and festivals in San Juan Chamula, Chiapas, but increasingly soda has been substituted for it.

Supporting sentences:
 Anabolic steroids are used for muscle-building and strength gain for cosmetic reasons as well as for performance-enhancement in athletics and bodybuilding. Anabolic steroids, also known more properly as anabolic–androgenic steroids (AAS), are steroidal androgens that include natural androgens like testosterone as well as synthetic androgens that are structurally related and have similar effects to testosterone.