Various styles of taekwondo (such as WTF/Kukkiwon -style or ITF/Chang Hon-style) have pre-defined taekwondo forms associated with them. These forms are used as part of training, and are also performed competitively at tournaments. In addition, however, many tournaments also conduct competitions in which practitioners perform taekwondo forms that they themselves have designed. Typically these are called freestyle or creative competitions. The idea is that these freestyle competitions allow practioners to showcase advanced techniques (such as highly acrobatic kicks, as just one example) that are not normally part of the standard curriculum of forms. A common example would be the tornado kick; despite being a signature technique for taekwondo, the tornado kick does not show up in any standard