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Saturday, June 4, 2011

sport shoes for teenagers

Athletic shoe is a generic name for the footwear primarily designed for sports or other forms of physical exercise but in recent years has come to be used for casual everyday activities.



They are also known as trainers (British English), sandshoes, gym boots or joggers (Australian English), running shoes, runners or gutties (Canadian English, Australian English, Hiberno-English), sneakers, tennis shoes (North American English, Australian English), gym shoes, tennies, sports shoes, sneaks, tackies (South African English and Hiberno-English), rubber shoes (Philippine English) or canvers (Nigerian English).
Etymology
The British English term "trainer" derives from "training shoe." There is evidence that this usage of "trainer" originated as a genericized tradename for a make of training shoe made in 1968 by Gola.
Plimsolls (English English) are indoor athletic shoes, and are also called sneakers in American English and daps in Welsh English. The word "sneaker" is often attributed to Henry Nelson McKinney, an advertising agent for N. W. Ayer & Son, who, in 1917, coined the term because the rubber sole made the shoe stealthy. However, the word was in use at least as early as 1887, as the Boston Journal of Education made reference to "sneakers" as "the name boys give to tennis shoes."
History
The idea of a "sneaker" did not come along until an American inventor, Charles Goodyear, patented the process for the vulcanization of rubber.
While many believe that the first basketball shoe was the famous Converse All Stars (developed in 1917), this is mistaken. The Spalding company produced shoes specifically for the game of basketball as early as 1907.[citation needed]
By the early 1900s, sneakers were being produced by small rubber companies who specialized in the production of bicycle tires. U.S. Rubber, introduced Keds in 1916, about the same time that Converse was marketing its All Star. Other companies, including B.F. Goodrich[disambiguation needed] and Spalding Co., were producing tennis shoes and smaller family-owned companies were manufacturing early cleated shoes. At first, the market for sneakers was small and practically invisible, but after World War I, the U.S. turned to sports and athletes as a way to demonstrate moral fiber and patriotism. The U.S. market for sneakers grew steadily as young boys lined up to buy sneakers endorsed by football player Jim Thorpe and Converse All Stars endorsed by basketball player Chuck Taylor.
As the 1920s and 1930s approached, these companies added traction, and also started marketing them for different sports. A huge breakthrough of this time was the separation of designs for men and women. At this time, sneakers were used strictly for athletic events. When the Olympics were revived, this attracted more fans not only to sports, but to sneakers as well. In 1936, a French brand by the name of Spring Court was born as the first canvas tennis shoe featuring signature 8 ventilation channels on the vulcanized natural rubber sole.
The 1950s gave American families more leisure time, and as the baby boom started, more families chose to dress their youth in sneakers as school dress codes relaxed. Sneaker sales in the United States soared to six hundred million pairs a year in 1957, which led leather shoe makers to claim that "sneakers are bad for children's feet" to which sneaker producers replied "sneakers cure the syndrome of Inhibited Feet."



In the early 1960s, sneakers were imported to the United States from Japan, but accounted for only a small portion of the market until Nike founders Phil Knight and Bill Bowerman began importing Tiger shoes under the name Blue Ribbon Sports.
In the 1970s, sneakers led their own way as jogging quickly became popular and so did the necessity to have a pair of shoes for the occasion. Until this time, factories had been concerned with high production, but now the companies started to market their products as a lifestyle purpose. Soon there were shoes for football, jogging, basketball, running—every sport had its own shoe. This was made possible by podiatrist development of athletic shoe technology.
By the 1980s, sneakers were everywhere; Woody Allen wore them to the ballet, Led Zeppelin wore them in their 1976 documentary, and Dustin Hoffman wore them while playing reporter Carl Bernstein in the movie All the President's Men. The shoes originally developed for sports became the mainstay for most people. Nike and Reebok were among the market leaders. Newer brands went in and out of fashion, and sneaker companies started shelling out major endorsements to players. One of, if not the largest, endorsements was to Chicago player Michael Jordan, for a contract with Nike to make his own signature line of shoes and apparel.
During the 1990s, shoe companies perfected their fashion and marketing skills. Sports endorsements grew larger and marketing budgets went through the roof. Sneakers became a fashion statement, and definition of identity and personality rather than humble athletic aids.Athletic shoes are also often worn by children to school.
The term athletic shoes is typically used for running in a marathon or half marathon, basketball, and tennis (amongst others) but tends to exclude shoes for sports played on grass such as association football and rugby football, which are generally known as "Studs," or in North America as cleats.
Attributes of an athletic shoe include a flexible sole, appropriate tread for the function ability to absorb impact. As the industry and design have expanded, the term "athletic shoes" is based more on the design of the bottom of the shoe than the aesthetics of the top of the shoe. Today's designs even include sandal, Mary Jane and even elevated styles suitable for running, dancing and jumping.
The shoes themselves are made of flexible compounds, typically featuring a sole made of dense rubber. While the original design was basic, manufacturers have since tailored athletic shoes for the different purposes that they can be used for. A specific example of this is the spiked shoe developed for track running. Many of these shoes are made up to a very large size because of athletes with large feet.
High-end marathon running shoes will often come in different shapes suited to different foot types, gait etc. Generally, these shoes are divided into neutral, overpronation and underpronation (supination) running shoes to fit the respective foot strike of the runners.As running shoes become more advanced, amateur joggers, as well as marathon runners, are beginning to purchase shoes based on their running style and foot arch. This is often important for injury prevention, as well as to increase running efficiency. There are a variety of specialized shoes designed for specific uses:
Racing flats
Track shoe
Skate shoes
Climbing shoe
Approach shoe
Wrestling shoes
Cleats
Football boot
Dance Shoe
Types
High-tops cover the ankle.
Low-tops do not cover the ankle.
Mid-cut are in-between high-tops and low-tops.
Sneaker boots extend to the calf.
Sneakers


A pair of sneakers
Sneakers or canvas shoes are casual athletic shoes.
Sneaker collectors, called "Sneakerheads", use sneakers as fashionable items. Casual sneakers like the Air Force One (Nike) or Superstar (Adidas) have become icons in today's pop culture. Artistically-modified sneakers can sell for upwards of $500. In more recent years, the classic shoe Nike Dunk has come to the attention of sneakerheads. During the release of these shoes people often line up several hours before the shops open, patiently waiting to get their hands on the shoes. Artistically modified sneakers can sell for up to $500 depending on their popularity. The opening day cost for these shoes can range from USD $60–300.
Shoe Game
The "Shoe Games" is a termed used by many people who buy and sells shoes for profit. This type of buying and re-selling started to become popular during the early 1970s when Nike first started to make basketball shoes, and began to rise with the introduction of "Air Force 1 (shoe)". In 1984 the Shoe Game took off with the introduction of Nike's "Air Jordan". As the years went on Nike Came out with many shoes, naming them after basketball players, and maximizing their profits by doing limited releases, meaning a store would only carry a certain amount of shoes and once all stores are out, no more reproductions are made, and that is how many "Sneakerheads" make their profits. Each year after the introduction of the first style of shoe Nike would name the next years version two, three, and so on. For example, one of the most profitable shoes was the Nike Air Jordans XXIII, the twenty third release of Nike's Air Jordans. Twenty-three was a big deal because Michael Jordan's number is Twenty-three. People camped out hours sometimes days before to buy these limited edition shoes. The "Shoe Game" became very popular and productive in the late 1990s' and continue to be very profitable until about 2010. This was mainly because the drop in the American Economy.

fixie - gear bicycle

A fixed-gear bicycle (or fixed-wheel bicycle, sometimes known as a fixie) is a bicycle that has no freewheel, meaning it cannot coast — the pedals are always in motion when the bicycle is moving.
The sprocket is screwed or bolted directly to a fixed rear hub. When the rear wheel turns, the pedals turn in the same direction.This allows a cyclist to stop without using a brake, by resisting the rotation of the cranks, and also to ride in reverse.

A fixed/freewheel rear hub (flip-flop)
The track bicycle is a form of fixed-gear bicycle used for track cycling in a velodrome. But since a "fixed-gear bicycle" is just a bicycle without a freewheel, a fixed-gear bicycle can be almost any type of bicycle.
Traditionally, some road racing, club cyclists used a fixed-gear bicycle for training during the winter months, generally using a relatively low gear ratio, believed to help develop a good pedalling style. In the UK until the 1950s it was common for riders to use fixed-gear bicycles for time trials. The 1959 British 25 mile time trial championship was won by Alf Engers with a competition record of 55 minutes 11 sec, riding an 84 inch fixed-gear bicycle.[4][5][6][7] The fixed-gear was also commonly used, and continues to be used in the end of season hill climb races in the autumn A typical club men's fixed-gear machine would have been a "road/path" or "road/track" cycle. In the era when most riders only had one cycle, the same bike when stripped down and fitted with racing wheels was used for road time trials and track racing, and when fitted with mudguards (fenders) and a bag, it was used for club runs, touring and winter training. By the 1960s, multi-gear derailleurs had become the norm and riding fixed-gear on the road declined over the next few decades.Recent[dated info] years have seen renewed interest and increased popularity of fixed-gear cycling.
In urban North America fixed-gear bicycles have achieved tremendous popularity, with the rise of discernible regional aesthetic preferences for finish and design details.
Dedicated fixed-gear road bicycles are being produced in greater numbers by established bicycle manufacturers. They are generally low in price and characterized by relaxed road geometry, as opposed to the steep geometry of track bicycles.
Fixed-gear bicycles are also used in cycle ball, bike polo and artistic cycling.
A fixed-gear bicycle is particularly well suited for track stands, a manoeuvre in which the bicycle can be held stationary, balanced upright with the rider's feet on the pedals.

Advantages and disadvantages
In slippery conditions some riders prefer to ride fixed because they believe the transmission provides increased feedback on back tire grip.
Descending any significant gradient is more difficult as the rider must spin the cranks at high speed (sometimes at 170 rpm or more), or use the brakes to slow down. Some consider that the enforced fast spin when descending increases suppleness or flexibility, which is said to improve pedalling performance on any type of bicycle
Riding fixed is considered by some to encourage a more effective pedaling style, which is claimed translates into greater efficiency and power when used on a bicycle fitted with a freewheel.
When first riding a fixed gear, a cyclist used to a freewheel may try to freewheel, or coast, particularly when approaching corners or obstacles. Since coasting is not possible this can lead to a 'kick' to the trailing leg, and even to loss of control of the bicycle.
Riding at high speed around corners can be difficult for the novice rider, as the pedals can strike the road, resulting in possible loss of control.
A fixed gear bicycle has fewer moving parts than a multi-gear bicycle and requires less maintenance.

Cyclist riding a fixed gear bike without brakes
Some fixed-gear riders think brakes are not strictly necessary, and brakeless fixed riding has a cult status in some areasBrakes and their cables are said to add extra bulk to the simple appearance of a fixed gear.
Other riders dismiss riding on roads without brakes as an affectation, based on image rather than practicality.Riding brakeless can be dangerous, is prohibited by law in many jurisdictions, and may jeopardize the chances of a successful claim in the event of an accident.
Technique
It is possible to slow down or stop a fixed-gear bike by resisting the turning cranks, and a rider can also lock the rear wheel and skid to slow down or stop on a fixed-gear bicycle. Such a move is initiated by unweighting the rear wheel while in motion by shifting the rider's weight slightly forward and pulling up on the pedals using clipless pedals or toe clips and straps. The rider then stops turning the cranks, thus stopping the drivetrain and rear wheel, while applying body weight in opposition to the rotation of the cranks. This causes the rear wheel to skid, and slow the bike. The skid can be held until the bicycle stops or until the rider desires to continue pedalling again at a slower speed. The technique requires a little practice and using it while cornering is generally considered dangerous.A wet surface further reduces the effectiveness of this method, almost to the point of not reducing speed at all.
On any bike with only rear wheel braking, the maximum deceleration is significantly lower than on a bike equipped with a front brake. As a vehicle brakes, weight is transferred towards the front wheel and away from the rear wheel, decreasing the amount of grip the rear wheel has. Transferring the rider's weight back will increase rear wheel braking efficiency, but a front wheel fitted with an ordinary brake might provide 70% or more of the braking power when braking hard (see Weight transfer).
Legality
United States — The use of any bike without brakes on public roads is illegal in many places, but the wording is often something along the lines of "...must be equipped with a brake that will enable the person operating the cycle to make the braked wheels skid on dry, level and clean pavement..." which some have argued allows the use of the legs and gears.The retail sale of bikes without brakes is banned by the U.S. Consumer Product Safety Commission– but with an exception for the "track bicycle" (...a bicycle designed and intended for sale as a competitive machine having tubular tires, single crank-to-wheel ratio, and no free-wheeling feature between the rear wheel and the crank....).
UK — The Pedal Cycles Construction and Use Regulations 1983 require pedal cycles "with a saddle height over 635 mm to have two independent braking systems, with one acting on the front wheel(s) and one on the rear". It is commonly thought that a front brake and a fixed rear wheel satisfies this requirement .
Germany — All bicycles are required to have working brakes on both wheels, as well as reflectors and bells. In Bonn a local court accepted that the fixed-gear mechanism was suitable back brake, but high-profile crackdowns specifically targeted fixies in Berlin, in an attempt to control what police described as a "dangerous trend"
Australia — In every state, bicycles are regarded as vehicles under the Road Rules. By law, a bike is required to have at least one functioning brake.
New Zealand — By law all bicycles must have a minimum of "...a good rear brake..."—and those made since 1 January 1988 must also have "...a good front brake..."
France — To be approved for road traffic, a bike must have 2 brakes, 2 lights, numerous reflectors, and a ringer. However the laws are rarely enforced, and the sight of all kinds of non officially approved bikes is quite common.
Denmark — All bicycles are required to have working brakes on both wheels, as well as reflectors and bells.