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Roller Sports
Roller sports are sports that use human powered vehicles which use rolling either by gravity or various pushing techniques. Typically ball bearings and polyurethane wheels are used for momentum and traction respectively, and attached to devices or vehicles that the roller puts his weight on. The international governing body is World Skate. List Roller sports include the following disciplines * Inline skating ** Vert Skating ** Aggressive inline skating ** Inline freestyle skating ** Inline figure skating ** Inline hockey ** Inline skater hockey ** Inline speed skating ** Roller soccer ** Inline alpine skating * Roller skating ** Artistic roller skating ** Roller speed skating ** Drafting ** Jam skating ** Roller derby ** Rink hockey * Road skating * Roller skiing ** Dry ski slope ** Grass skiing ** Indoor ski slope ** Roller cross-country skiing ** Roller alpine skiing * Skateboarding ** Freestyle skateboarding ** Skateboarding trick ** Street skateboarding ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ball Bearings
A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It achieves this by using at least two races to contain the balls and transmit the loads through the balls. In most applications, one race is stationary and the other is attached to the rotating assembly (e.g., a hub or shaft). As one of the bearing races rotates it causes the balls to rotate as well. Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other. Ball bearings tend to have lower load capacity for their size than other kinds of rolling-element bearings due to the smaller contact area between the balls and races. However, they can tolerate some misalignment of the inner and outer races. History Although bearings had been developed since ancient times, the first m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Road Skating
Road skating is the sport of skating (inline skating or quad roller skating) on roads, much like road cycling. It shares much with inline speed skating. Roadskaters often skate in tight packs, drafting each other and sharing the lead, which allows a pack to travel faster than an individual skater. The individual members of a pack use comparatively less energy than the lone skater traveling at the same speed. Even the lead skater in the pack enjoys an advantage from the drafting skaters behind. While gliding downhill, an inline skater in a tucked position can achieve speeds that exceed the speed of a tucked cyclist. This is due to lower wind resistance. The rolling resistance is similar for a cyclist and a skater — it is only when actively skating (i.e., in the skating stroke) that the skater incurs greater resistance. Skating is roughly 50% slower than cycling on flat ground. Skaters routinely achieve downhill speeds of 60 km/h (37 mph), similar to cyclists. Compa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roller Derby
Roller derby is a roller skating contact sport played by two teams of fifteen members. Roller derby is played by approximately 1,250 amateur leagues worldwide, mostly in the United States. Game play consists of a series of short scrimmages (jams) in which both teams designate a jammer (who uniquely wears a star on the helmet) and four blockers to skate counter-clockwise around a track. The jammer scores points by lapping members of the opposing team. The teams attempt to hinder the opposing jammer while assisting their own jammer—in effect, playing both offense (sports), offense and defense (sports), defense simultaneously. Overview While the sport has its origins in the banked-track roller-skating marathons of the 1930s, Leo Seltzer and Damon Runyon are credited with evolving the sport to its competitive form. Professional roller derby quickly became popular; in 1940, more than 5 million spectators watched in about 50 American cities. In the ensuing decades, however, it predo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rink Hockey
Roller hockey (in British English), rink hockey (in American English) or quad hockey is a team sport played on roller skates. It is the only quad skate team sport in existence where two teams face-off against one another at the same time. Two teams try to drive a hard ball with their sticks into the opposing teams' goalnet. Each team has five players on the rink at a time, four of whom are skaters and one who is the goalkeeper. The ball can only be put in motion by a stick, not the skate, otherwise a foul will be stated. The game has two 25-minute halves, with 15-minute halftime intermission, plus up to two 5-minute golden goal (a.k.a. "sudden death") periods to settle ties with the clock stopping when the ball becomes dead. If the tie persists, a penalty shootout will determine the winner. Players – including the goalie – use quad skates, whereas inline skates are used in inline hockey. The sticks are similar to those in bandy and shinty. Excessive contact between players is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inline Hockey
Roller inline hockey, or inline hockey is a variant of hockey played on a hard, smooth surface, with players using inline skates to move and ice hockey sticks to shoot a hard, plastic puck into their opponent's goal to score points. The sport is a very fast-paced and free-flowing game and is considered a contact sport, but body checking is prohibited. There are five players including the goalkeeper from each team on the rink at a time, while teams normally consist of 16 players. There are professional leagues, one of which is the National Roller Hockey League (NRHL). While it is not a contact sport, there are exceptions, i.e. the NRHL involves fighting. Unlike ice hockey, there are no blue lines or defensive zones in roller hockey. This means that, according to most rule codes, there are no offsides or icings that can occur during game play. This along with fewer players on the rink allows for faster gameplay. There are traditionally two 20-minute periods or four 10-minu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skateboarding Styles
A skateboard style refers to the way a skateboarder prefers to ride a skateboard. Skateboard styles can be broadly divided into two different categories: skateboarding to perform tricks and skateboarding as a means of transportation. Styles of skateboarding have evolved over time and are influenced by a number of factors including sociocultural evolution, mass media, music, technology, corporate influence and individual skill level. The styles used by different skateboarders when riding skateboards should not be confused with skater style, the manner in which skateboarders dress or act in relation to skateboarding culture. Styles Freestyle Probably the oldest style of skateboarding, freestyle skateboarding developed from the use of skateboards as a mode of transport in the 1960s. Professional freestyle competitions often involved music and choreography and focused on fluidity and technical skill. The style changed significantly with the introduction of ollies and other trick ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freestyle Scootering
Freestyle scootering (also known as scootering or scooter riding) is an extreme sport that involves using kick scooters to perform freestyle tricks. This is done mainly in skateparks but also in urban environments on obstacles such as stairs, hand rails and curbs. Freestyle scootering gained popularity following the ''Razor craze'' in the early 2000s after the invention of the foldable aluminium scooter by Micro Mobility Systems in 1999. Since then the construction of pro scooters have progressed immensely, making it a big business with many brands solely focusing on creating trick scooters world wide. Early years After the first version of the foldable kick scooter, invented by Swiss banker Wim Ouboter (founder of Micro-Mobility Switzerland), hit the market in 1999, scooters became extremely popular amongst kids worldwide. Micro was the first to produce and sell these scooters. Shortly after, Micro licensed their new invention to JD Sports who would go on to sell the scoo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Street Skateboarding
Street skateboarding is a skateboarding discipline which focuses on flat-ground tricks, grinds, slides and aerials within urban environments, and public spaces. Street skateboarders meet, skate, and hang out in and around urban areas referred to as " spots," which are commonly streets, plazas or industrial areas. To add variety and complexity to street skateboarding, obstacles such as handrails, stairs, walls, flower beds, bins, park benches, picnic tables, and other street furniture may be traversed as single tricks or as part of a series of consecutive tricks called a "line." History During the late 1980s and early 1990s, street skateboarding evolved as a new approach to skateboarding, using elements taken from the other existing skateboarding disciplines. Instead of drained swimming pools and purpose-built skateparks, skateboarders began to use urban areas and public spaces. For example, in the 1980s, Philadelphia's LOVE Park transformed from a place where businessp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skateboarding Trick
A skateboarding trick, or simply a trick, is a maneuver performed by manipulating a skateboard, usually with one's feet, in a specific way to achieve the desired outcome – the trick. History Though skateboards emerged in the 1900s, skateboarding tricks like the ones done today did not appear until decades later. In the 1970s and earlier, the most common tricks were "2D" freestyle types such as manuals and pivots. Only later in the 1980s and early 1990s were common modern-day tricks like the ollie and heel-flip invented by Alan Gelfand and Rodney Mullen, setting the stage for other aerial tricks. Types Ollie An ollie is a jump where the front wheels leave the ground first. This motion is attained with a snap of the tail (from the back foot) and sliding one's front foot forward to reach any altitude. A lot of technical tricks transpire from this element (e.g. the kickflip, heelflip, 360-flip). A ''nollie'' is when the back wheels leave the ground first by snapping the nos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freestyle Skateboarding
Freestyle skateboarding (or freestyle) is one of the oldest styles of skateboarding and was intermittently popular from the 1960s until the early 1990s, when the final large-scale professional freestyle skateboarding competition was held. Description The emphasis in freestyle is technical flat ground skateboarding. Often a freestyler will need little more than a board and a smooth, flat surface. Music and choreography have always been an essential part of the professional freestyle routine. History 1950s and 1960s Freestyle in the 1950s was created by members of the surfing culture who sought an alternative during times when conditions were not conducive to surfing—surfers would imitate their water-based maneuvers on skateboards when ocean conditions were poor. In the 1960s, many freestyle tricks were derived from gymnastics and dancing. 1970s and 1980s The following two decades were defined by a progression towards technical, fluid, and more creative routines. Influential ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skateboarding
Skateboarding is an action sport originating in the United States that involves riding and performing tricks using a skateboard, as well as a recreational activity, an art form, an entertainment industry job, and a method of transportation. Skateboarding has been shaped and influenced by many skateboarders throughout the years. A 2009 report found that the skateboarding market is worth an estimated $4.8 billion in annual revenue, with 11.08 million active skateboarders in the world. In 2016, it was announced that skateboarding would be represented at the 2020 Summer Olympics in Tokyo, for both male and female teams. Since the 1970s, skateparks have been constructed specifically for use by skateboarders, freestyle BMXers, aggressive skaters, and more recently, scooters. However, skateboarding has become controversial in areas in which the activity, although illegal, has damaged curbs, stoneworks, steps, benches, plazas, and parks. History 1940s–1960s The first skateboar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indoor Ski Slope
Indoor skiing is done in a climate-controlled environment with artificially produced snow. This enables skiing and snowboarding to take place regardless of outdoor temperatures. Facilities for both alpine skiing and nordic skiing are available. History Since the early 20th century, there have been four major stages in the evolution of indoor snow centres. Firstly, centres that had no refrigeration and used an artificial mixture of materials to create a surface substance something like snow, the first of these opened in Austria and Germany in the 1920s. The first recorded indoor “snow” slope was created at Berlin’s Automobilhalle in April 1927 gaining worldwide attention. According to contemporary reports a wooden slope was created about 720 feet long and sixty feet wide. The "snow" substitute used was invented and later patented by a British diplomat, L. C. Ayscough, and involved a mixture of powdered mica, soda crystals and sawdust spread on a brush matting surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
