Olympic discipline at every Winter Games since 1924. Freeriding skiing – This category of skiing includes any practice of the sport on non-groomed terrain. Nordic combined – A combination of cross-country skiing and ski jumping, this discipline is contested at the FIS Nordic Combined World Cup, the FIS Nordic World Ski Championships (odd-numbered years only), and at the Winter Olympics. Alpine skiing – Includes downhill, slalom, giant slalom, super giant slalom (super-G), and para-alpine events. There are also combined events where the competitors must complete one run of each event, for example; the Super Combined event consists of one run of super-G and one run of slalom skiing. The dual slalom event, where racers ski head-to-head, was invented in 1941 and has been a competitive event since 1960. Alpine skiing is contested at the FIS Alpine Ski World Cup, the FIS Alpine World Ski Championships (held only in odd-numbered years), and the Winter Olympics. Para-alpine skiing is contested at the World Para Alpine Skiing Championships (odd-numbered years) and the Winter Paralympics. Speed skiing – Dating from 1898, with official records beginning in 1932 with an run by Leo Gasperi, this became an FIS discipline in the 1960s. It is contested at the FIS Speed Ski World Cup, and was demonstrated at the 1992 Winter Olympics in Albertville. Freestyle skiing – Includes mogul skiing, aerials, ski cross, half-pipe, and slopestyle. The main freestyle competitions are the FIS Freestyle Skiing World Cup and the FIS Freestyle World Ski Championships (held in odd-numbered years). The discipline was first demonstrated at the 1988 Winter Olympics and was added to the Olympic programme in 1992. It became an Olympic sport in the 2014 Sochi Olympic games when the Slope-style and Half pipe events were introduced. Snowboarding – Disciplines include slopestyle, cross, half-pipe, alpine, parallel slalom, and parallel giant slalom. The main competitions are the annual FIS Snowboard World Cup and the FIS Snowboard World Championships (held in odd-numbered years). Snowboarding debuted as an Olympic discipline in 1998 (as part of the Alpine skiing programme) and was contested as a separate discipline at the 2018 Winter Olympics. Skiboarding – Using a snowboard in conjunction with standard ski boots, this discipline is essentially a combination of skiing and snowboarding. Various skiboarding competitions have been tried over recent years, including the Skiboard Triple Challenge, United Skiboard Series, European Skiboard Cup, Skiboard World Cup, and the US Skiboard Open.