History of wrestling
When the First Modern Olympic Games held in Athens in 1896, Greco-Roman wrestling was introduced as an Olympic discipline. After not being featured in the 1900 Olympics, sports wrestling was seen again in 1904 in St. Louis; this time in freestyle competition. Since then, Greco-Roman and freestyle wrestling have both been featured (with women's freestyle added in the Summer Olympics of 2004).
Freestyle skiing at the Winter Olympics
Freestyle skiing was a demonstration sport at the 1988 Winter Olympics, with moguls, aerials, and ballet events. Moguls became an official medal sport at the 1992 games, while aerials and ballet were still demonstration events. At the 1994 games, aerials also became an official medal event and the ski ballet competition was dropped. For the 2010 Winter Olympics, ski cross was added to the program while for the 2014 Winter Olympics half-pipe and slopestyle were added.