Cross-country skiing

hunter using skis of unequal length—short for traction, long for gliding—and a single pole. Both were employed until . (1673 woodcut) The word ski comes from the Old Norse word which means stick of wood. Skiing started as a technique for traveling cross-country over snow on skis, starting almost five millennia ago with beginnings in Scandinavia. It may have been practised as early as 600 BCE in Daxing'anling, in what is now China. Early historical evidence includes Procopius's (around CE 550) description of Sami people as skrithiphinoi translated as "ski running samis". Birkely argues that the Sami people have practiced skiing for more than 6000 years, evidenced by the very old Sami word čuoigat for skiing. Egil Skallagrimsson's 950 CE saga describes King Haakon the Good's practice of sending his tax collectors out on skis. The Gulating law (1274) stated that "No moose shall be disturbed by skiers on private land." Early skiers used one long pole or spear in addition to the skis. The first depiction of a skier with two ski poles dates to 1741. Traditional skis, used for snow travel in Norway and elsewhere into the 1800s, often comprised one short ski with a natural fur traction surface, the andor, and one long for gliding, the langski—one being up to longer than the other—allowing skiers to propel themselves with a scooter motion. This combination has a long history among the Sami people. Skis up to 280 cm have been produced in Finland, and the longest recorded ski in Norway is 373 cm. Transportation '' military patrol on skis training in the Giant Mountains, January 1932. Ski warfare, the use of ski-equipped troops in war, is first recorded by the Danish historian Saxo Grammaticus in the 13th century. These troops were reportedly able to cover distances comparable to that of light cavalry. The garrison in Trondheim used skis at least from 1675, and the Danish-Norwegian army included specialized skiing battalions from 1747—details of military ski exercises from 1767 are on record. Skis were used in military exercises in 1747. In 1799 French traveller Jacques de la Tocnaye recorded his visit to Norway in his travel diary: Norwegian immigrants used skis ("Norwegian snowshoes") in the US midwest from around 1836. Norwegian immigrant "Snowshoe Thompson" transported mail by skiing across the Sierra Nevada between California and Nevada from 1856. Sport , 2007.|thumb|right Norwegian skiing regiments organized military skiing contests in the 18th century, divided in four classes: shooting at a target while skiing at "top speed", downhill racing among trees, downhill racing on large slopes without falling, and "long racing" on "flat ground". This technique was later used in ski orienteering in the 1960s on roads and other firm surfaces. It became widespread during the 1980s after the success of Bill Koch (United States) in 1982 Cross-country Skiing Championships drew more attention to the skating style. Norwegian skier Ove Aunli started using the technique in 1984, when he found it to be much faster than classic style. Finnish skier, Pauli Siitonen, developed a one-sided variant of the style in the 1970s, leaving one ski in the track while skating to the side with the other one during endurance events; this became known as the "marathon skate". Terminology and Hjalmar Johansen at the camp of Frederick Jackson on Northbrook Island in 1896. The word ski comes from the Old Norse word which means "cleft wood", "stick of wood" or "ski". Norwegian language does not use a verb-form equivalent in idiomatic speech, unlike English "to ski". In modern Norwegian, a variety of terms refer to cross-country skiing, including: • (literally "walk on skis")—a general term for self-propelled skiing • (literally "hiking on skis")—refers to ski touring as recreation • (literally "long race")—refers to cross-country ski racing In contrast, alpine skiing is referred to as (literally "stand on skis"). Fridtjof Nansen, describes the crossing of Greenland as , literally "On skis across Greenland", while the English edition of the report was titled, The first crossing of Greenland. Nansen referred to the activity of traversing snow on skis as (he used the term also in the English translation), which may be translated as ski running. Nansen used , regarding all forms of skiing, but noted that ski jumping is purely a competitive sport and not for amateurs. He further noted that in some competitions the skier "is also required to show his skill in turning his ski to one side or the other within given marks" at full speed on a steep hill. Nansen regarded these forms (i.e., jumping and slalom) as "special arts", and believed that the most important branch of skiing was travel "in an ordinary way across the country". In Germany, Nansen's Greenland report was published as (literally "On snowshoes through Greenland"). The German term, , was supplanted by the borrowed Norwegian word, , in the late 19th century. ==Recreation==

Recreational cross-country skiing includes ski touring and groomed-trail skiing, typically at resorts or in parklands. It is an accessible form of recreation for persons with vision and mobility impairments. A related form of recreation is dog skijoring—a winter sport where a cross-country skier is assisted by one or more dogs. Ski touring Ski touring takes place off-piste and outside of ski resorts. Tours may extend over multiple days. Typically, skis, bindings, and boots allow for free movement of the heel to enable a walking pace, as with Nordic disciplines and unlike Alpine skiing. Ski touring's subgenre ski mountaineering involves independently navigating and route finding through potential avalanche terrain and often requires familiarity with meteorology along with skiing skills. Ski touring can be faster and easier than summer hiking in some terrain, allowing for traverses and ascents that would be harder in the summer. Skis can also be used to access backcountry alpine climbing routes when snow is off the technical route, but still covers the hiking trail. In some countries, organizations maintain a network of huts for use by cross-country skiers in wintertime. For example, the Norwegian Trekking Association maintains over 400 huts stretching across thousands of kilometres of trails which hikers can use in the summer and skiers in the winter. Groomed-trail skiing , track-set for classic skiing at the sides and groomed for skate skiing in the center. Groomed trail skiing occurs at facilities such as Nordmarka (Oslo), Royal Gorge Cross Country Ski Resort and Gatineau Park in Quebec, where trails are laid out and groomed for both classic and skate-skiing. Such grooming and track setting (for classic technique) requires specialized equipment and techniques that adapt to the condition of the snow. Trail preparation employs snow machines which tow snow-compaction, texturing and track-setting devices. Groomers must adapt such equipment to the condition of the snow—crystal structure, temperature, degree of compaction, moisture content, etc. Depending on the initial condition of the snow, grooming may achieve an increase in density for new-fallen snow or a decrease in density for icy or compacted snow. Cross-country ski facilities may incorporate a course design that meets homologation standards for such organizations as the International Olympic Committee, the International Ski Federation, or national standards. Standards address course distances, degree of difficulty with maximums in elevation difference and steepness—both up and downhill, plus other factors. Some facilities have night-time lighting on select trails—called lysløype (light trails) in Norwegian and elljusspår (electric-light trails) in Swedish. The first lysløype opened in 1946 in Nordmarka and at Byåsen (Trondheim). ==Competition==

Cross-country ski competition encompasses a variety of formats for races over courses of varying lengths according to rules sanctioned by the International Ski and Snowboard Federation (FIS) and by national organizations, such as the U.S. Ski and Snowboard Association and Cross Country Ski Canada. It also encompasses cross-country ski marathon events, sanctioned by the Worldloppet Ski Federation, cross-country ski orienteering events, sanctioned by the International Orienteering Federation, and Paralympic cross-country skiing, sanctioned by the International Paralympic Committee. FIS-sanctioned competition with classic technique in the women's 10 km classic race at the 2011 FIS Nordic World Ski Championships in Oslo, Norway.|thumb|right The FIS Nordic World Ski Championships have been held in various numbers and types of events since 1925 for men and since 1954 for women. From 1924 to 1939, the World Championships were held every year, including the Winter Olympic Games. After World War II, the World Championships were held every four years from 1950 to 1982. Since 1985, the World Championships have been held in odd-numbered years. Notable cross-country ski competitions include the Winter Olympics, the FIS Nordic World Ski Championships, and the FIS World Cup events (including the Holmenkollen). Other sanctioned competition Cross-country ski marathons—races with distances greater than 40 kilometers—have two cup series, the Ski Classics, which started in 2011, and the Worldloppet. Biathlon combines cross-country skiing and rifle shooting. Depending on the shooting performance, extra distance or time is added to the contestant's total running distance/time. For each shooting round, the biathlete must hit five targets; the skier receives a penalty for each missed target, which varies according to the competition rules. Ski orienteering is a form of cross-country skiing competition that requires navigation in a landscape, making optimal route choices at racing speeds. Standard orienteering maps are used, but with special green overprinting of trails and tracks to indicate their navigability in snow; other symbols indicate whether any roads are snow-covered or clear. Standard skate-skiing equipment is used, along with a map holder attached to the chest. It is one of the four orienteering disciplines recognized by the International Orienteering Federation. Upper body strength is especially important because of frequent double poling along narrow snow trails. Paralympic cross-country ski competition is an adaptation of cross-country skiing for athletes with disabilities. Paralympic cross-country skiing includes standing events, sitting events (for wheelchair users), and events for visually impaired athletes under the rules of the International Paralympic Committee. These are divided into several categories for people who are missing limbs, have amputations, are blind, or have any other physical disability, to continue their sport. ==Techniques==

.|thumb|right Cross-country skiing has two basic propulsion techniques, which apply to different surfaces: classic (undisturbed snow and tracked snow) and skate skiing (firm, smooth snow surfaces). The classic technique relies on a wax or texture on the ski bottom under the foot for traction on the snow to allow the skier to slide the other ski forward in virgin or tracked snow. With the skate skiing technique a skier slides on alternating skis on a firm snow surface at an angle from each other in a manner similar to ice skating. Both techniques employ poles with baskets that allow the arms to participate in the propulsion. Specialized equipment is adapted to each technique and each type of terrain. A variety of turns are used, when descending. On uphill terrain, techniques include the "side step" for steep slopes, moving the skis perpendicular to the fall line, the "herringbone" for moderate slopes, where the skier takes alternating steps with the skis splayed outwards, and, for gentle slopes, the skier uses the diagonal technique with shorter strides and greater arm force on the poles. A variant of the technique is the "marathon skate" or "Siitonen step", where the skier leaves one ski in the track while skating outwards to the side with the other ski. Turns Turns, used while descending or for braking, include the snowplough (or "wedge turn"), the stem christie (or "wedge christie"), ==Equipment==

s. Equipment comprises skis, poles, boots and bindings; these vary according to: • Technique, classic vs skate • Terrain, which may vary from groomed trails to wilderness • Performance level, from recreational use to competition at the elite level Glide wax may be used on the tails and tips of classic skis and across the length of skate skis. Types Each type of ski is sized and designed differently. Length affects maneuverability; camber affects pressure on the snow beneath the feet of the skier; side-cut affects the ease of turning; width affects forward friction; overall area on the snow affects bearing capacity; and tip geometry affects the ability to penetrate new snow or to stay in a track. Each of the following ski types has a different combination of these attributes: • Classic skis: Designed for skiing in tracks. For adult skiers (between 155 cm/50 kg and 185 cm/75 kg), recommended lengths are between 180 and 210 centimetres (approximately 115% of the skier's height). Traction comes from a "grip zone" underfoot that when bearing the skier's weight engages either a textured gripping surface or a grip wax. Accordingly, these skis are classified as "waxable" or "waxless". Recreational waxless skis generally require little attention and are adapted for casual use. Waxable skis, if prepared correctly, provide better grip and glide. :When the skier's weight is distributed on both skis, the ski's camber diminishes the pressure of the grip zone on the snow and promotes bearing on the remaining area of the ski—the "glide zone". A test for stiffness of camber is made with a piece of paper under the skier's foot, standing on skis on a flat, hard surface—the paper should be pinned throughout the grip zone of the ski on which all the skier's weight is placed, but slide freely when the skier's weight is bearing equally on both skis. Gliding surface Glide waxes enhance the speed of the gliding surface. The wax is either melted on the base using an iron or applied in a liquid form. The excess wax is first scraped off and then finished by brushing. Most glide waxes are based on paraffin that is combined with additive materials. The paraffin hardness and additives are varied based on snow type, humidity and temperature. Since the 2021–2022 race season, fluorinated products are banned in FIS sanctioned competitions. Before the ban, most race waxes combined fluorinated hydrocarbon waxes with fluorocarbon overlays. Fluorocarbons decrease surface tension and surface area of the water between the ski and the snow, increasing speed and glide of the ski under specific conditions. Either combined with the wax or applied after in a spray, powder, or block form, fluorocarbons significantly improve the glide of the ski. Traction surface Skis designed for classic technique, both in track and in virgin snow, rely on a traction zone, called the "grip zone" or "kick zone", underfoot. This comes either from a) texture, such as "fish scales" or mohair skins, designed to slide forward but not backwards, that is built into the grip zone of waxless skis, or from applied devices, e.g. climbing skins, or b) from grip waxes. Grip waxes are classified according to their hardness: harder waxes are for colder and newer snow. An incorrect choice of grip wax for the snow conditions encountered may cause ski slippage (wax too hard for the conditions) or snow sticking to the grip zone (wax too soft for the conditions). • Standardized system: Boots and bindings have an integrated connection, typically a bar across the front end of the sole of the boot, and platform on which the boot rests. Two families of standards prevail: NNN (New Nordic Norm) and SNS (Salomon Nordic System) Profil. Both systems have variants for skiing on groomed surfaces and in back country. These systems are the most common type of binding. • Three-pin: The boot-gripping system comprises three pins that correspond to three holes in the sole of the boot's toe, used primarily for back-country skiing. • Cable: A cable secures the free-moving heel and keeps the toe of the boot pushed into a boot-gripping section, used primarily for back-country and telemark skiing. Poles Ski poles are used for balance and propulsion. Modern cross-country ski poles are made from aluminium, fibreglass-reinforced plastic, or carbon fibre, depending on weight, cost and performance parameters. Formerly they were made of wood or bamboo. They feature a foot (called a basket) near the end of the shaft that provides a pushing platform, as it makes contact with the snow. Baskets vary in size, according to the expected softness/firmness of the snow. Racing poles feature smaller, lighter baskets than recreational poles. Poles designed for skating are longer than those designed for classic skiing. Traditional skiing in the 1800s used a single pole for both cross-country and downhill. The single pole was longer and stronger than the poles that are used in pairs. In competitive cross-country poles in pairs were introduced around 1900. ==Gallery==

Image:Skigudinne.jpg|An early depiction of a skier—a Sami woman or goddess hunting on skis by Olaus Magnus (1553). File:Birkebeinerne ski01.jpg|Loyal retainers transporting Prince Haakon IV of Norway to safety on skis during the winter of 1206–1869 depiction by Knud Bergslien. File:138. Kronprins Olav - no-nb digifoto 20150710 00006 bldsa pk kgl0061.jpg|Olav V of Norway as crown-prince in 1939 Image:olympic skier in ice storm.jpg|A skate-skier in Gatineau Park, Quebec, a North American groomed-trail ski venue. File:AchenseeWinter01.JPG|A recreational cross-country trail, groomed for classic skiing only, in Tyrol. File:Blind skier and guide.jpg|A blind cross-country skier with guide at a regional Ski for Light event. File:Skijor worlds.jpg|Dog skijoring—dogs provide added propulsion to the cross-country skier. ==References==