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Information about Dumbbell

For other meanings, see dumbbell (disambiguation).
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A pair of spinlock dumbbells with 2 kg plates.
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A dumbbell


A dumbbell is a piece of equipment used in weight training, and are considered a type of free weight. It is a weight that is usually held in one hand. Hence, dumbbells normally come in pairs. The forerunner of the dumbbell was used in India for more than a millennium, shaped like a club - so named Indian club. The design of the "Nal" as the equipment was referred to can be seen as a halfway point between a barbell and a dumbbell. It was generally used in pairs, in workouts by wrestlers, bodybuilders, sports players, and others wishing to increase strength and muscle size.

"Dumbbells" as a word originated in Tudor England— strongmen used hand-held church bells to develop the upper body and arms. These bells range in weight from a few ounces to many pounds. The bells were flourished in various ways. Obviously this would have a made racket so the strongmen would take out the clappers (the thing inside the bell which hits the sides of the bell and makes the noise) so they could practice quietly; hence the name "dumb" as in "no sound" and "bell" - dumbell. When strongmen started to make their own equipment they kept the name, even though the shape changed. Kettles were also available in various sizes ranging up to those holding several gallons. Filled with sand or water these too could be used for training. When strongmen started making purpose-built equipment, they also kept the name.

By the early 19th Century, the familiar shape of the dumbbell, with two equal weights attached to a handle, had appeared. There are currently two main types of dumbbell:
  • Adjustable dumbbells consist of 14 inch (35 centimetre) long steel bars that are one inch (2.5 centimetres) in diameter. They look like miniature barbells. The centre portion is engraved with a crosshatch pattern (knurling) to help users get a good grip. 1–40 kg of cast iron weight disks (plates) are slid onto the outer portions of the dumbbell to obtain the desired total weight. These weights are secured with clips or collars. A "spinlock" dumbbell's outer portions are threaded, and the collars are large nuts that screw on and secure the plates through friction.
  • Fixed-weight dumbbells are weights created in a dumbbell shape. Expensive varieties consist of cast iron coated with rubber for safety. Cheaper versions consist of a rigid plastic shell that is filled with concrete.
Due to their flexibility, dumbbells can be used in all types of resistance weight training, but the most popular dumbbell exercises remain the Bench press and the Biceps curl. Using dumbbells (especially adjustable dumbbells) often without wearing weightlifting gloves causes calluses on the palm of the hand. They are not detrimental to weight training, but some users dislike them and prefer to use weight training gloves.

The word "dumbbell" is used in the United Kingdom and the United States as an insulting term for a person considered to be stupid or unintelligent.

See also

  • A dumbbell is a piece of equipment used in weight training.
  • The Dumbbell Nebula is a planetary nebula (M27), which is shaped like a dumbbell.
  • "Dumbbell" is a term used pejoratively as a mild insult, describing someone who is perceived as stupid.

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Weight training is a common type of strength training for developing the strength and size of skeletal muscles. It uses the force of gravity (in the form of weighted bars, dumbbells or weight stacks) to oppose the force generated by muscle through concentric or eccentric
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weight is a measurement of the gravitational force acting on an object. Near the surface of the Earth, the acceleration due to gravity is approximately constant; this means that an object's weight is roughly proportional to its mass.
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club is an association of people united by a common interest or goal. The service club, for example, exists for voluntary or charitable activities; there are clubs devoted to hobbies and sports, social activities clubs, political and religious clubs, and so forth.
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Indian clubs are a category of exercise equipment popular in the late 19th and early 20th century in Europe, the British Commonwealth and the United States. They comprise bowling-pin shaped wooden "clubs" of varying sizes and weights, which are swung in certain patterns as part of
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barbell is a piece of exercise equipment used in weight training, weightlifting and powerlifting. It consists of a steel bar that is 5 to 7 feet (approx. 2 metres) long. The central portion varies in diameter, but is close to one inch (2.
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Wrestling is the act of physical engagement between two unarmed persons, in which each wrestler strives to get an advantage over or control of their opponent. Physical techniques which embody the style of wrestling are clinching, holding, locking, and leverage.
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Tudor period usually refers to the period between 1485 and 1603, specifically in relation to the history of England. This coincides with the rule of the Tudor dynasty in England.
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Motto
Dieu et mon droit   (French)
"God and my right"
Anthem
No official anthem specific to England — the anthem of the United Kingdom is "God Save the Queen".
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For the periodical, see .
The 19th Century (also written XIX century) lasted from 1801 through 1900 in the Gregorian calendar. It is often referred to as the "1800s.
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1 inch =
SI units
010−3 m 0 mm
US customary / Imperial units
010−3 ft 010−3 yd


An inch (plural: inches; symbol or abbreviation: in or, sometimes,  
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1 centimetre =
SI units
010−3 m 0 mm
US customary / Imperial units
010−3 ft 0 in
A centimetre (American spelling: centimeter, symbol cm
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Steel is an alloy consisting mostly of iron, with a carbon content between 0.02% and 1.7 or 2.04% by weight (C:1000–10,8.67Fe), depending on grade. Carbon is the most cost-effective alloying material for iron, but various other alloying elements are used such as manganese and
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barbell is a piece of exercise equipment used in weight training, weightlifting and powerlifting. It consists of a steel bar that is 5 to 7 feet (approx. 2 metres) long. The central portion varies in diameter, but is close to one inch (2.
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The pattern is a form, template, or model (or, more abstractly, a set of ) which can be used to make or to generate things or parts of a thing, especially if the things that are created have enough in common for the underlying pattern to be inferred, in which case the things are
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kilogram or kilogramme (symbol: kg) is the SI base unit of mass. The kilogram is defined as being equal to the mass of the International Prototype Kilogram (IPK), which is almost exactly equal to the mass of one liter of water.
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Iron-Cementite meta-stable diagram.]] Cast iron usually refers to grey cast iron, but identifies a large group of ferrous alloys, which solidify with a eutectic.

Overview


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A nut is a type of hardware fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten a stack of parts together. The two partners are kept together by a combination of their threads' friction, a slight stretch of the bolt, and compression of the
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Weights are exercise equipment used for strength training. The term is commonly used as a shortened form of the term free weights, but it can also refer to any exercise machine that uses weighted plates as the major opposing force.
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Natural rubber is an elastic hydrocarbon polymer that naturally occurs as a milky colloidal suspension, or latex, in the sap of some plants. It can also be synthesized. The entropy model of rubber was developed in 1934 by Werner Kuhn.
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Plastic is the general term for a wide range of synthetic or semisynthetic polymerization products. They are composed of organic condensation or addition polymers and may contain other substances to improve performance or economics.
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Concrete is a construction material that consists of cement (commonly Portland cement) as well as other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate such as gravel limestone or granite, plus a fine aggregate such as sand or
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bench press is a form of weightlifting which primarily focuses on the development of the pectoralis major muscle as well as other supporting muscles. It is also one of the three lifts in the sport of powerlifting.
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biceps curl is any of a number of weight training exercises which target the biceps brachii muscle in order to develop one or more of the following attributes:
  • size
  • definition
  • strength
  • stamina

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Callus
Classification & external resources

ICD-10 L 84.
ICD-9 700

This article is about calluses and corns of human skin. For other uses, see Callus (disambiguation).

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Motto
"Dieu et mon droit" [2]   (French)
"God and my right"
Anthem
"God Save the Queen" [3]
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Motto
"In God We Trust"   (since 1956)
"E Pluribus Unum"   ("From Many, One"; Latin, traditional)
Anthem
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barbell is a piece of exercise equipment used in weight training, weightlifting and powerlifting. It consists of a steel bar that is 5 to 7 feet (approx. 2 metres) long. The central portion varies in diameter, but is close to one inch (2.
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kettlebell or girya (Russian: гиря) is a traditional Russian cast iron weight looking somewhat like a cannonball with a handle. The kettlebell has become a popular exercise tool due largely to the efforts of strength and flexibility coach Pavel
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Weights are exercise equipment used for strength training. The term is commonly used as a shortened form of the term free weights, but it can also refer to any exercise machine that uses weighted plates as the major opposing force.
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