Sailing/Yachting is an Olympic sport that has been part of the Olympic programme starting from the Games of the 1st Olympiad (1896 Olympics in Athens, Greece).
 With the exception of 1904 and possibly 1916, sailing has always been an Olympic event.
 The Sailing program in 2004 consisted of eleven disciplines divided over nine sailing classes.
 For each discipline multiple races were scheduled between 14–28 August 2004 along the coast near Athens.
 Athens hosted the Olympic sailing competitions for the second time, having previously done so during the 1896 Summer Olympics.
 However, in 1896, the sailing competition was cancelled due to heavy storms and further bad weather conditions.
 This time the weather conditions were good.
 The sailing event was executed on the several types of Olympic courses in different course areas using the 'Fleetrace' and 'Matchrace' formats.
Tennis was first contested as a Summer Olympic sport in the 1896 Olympic Games, held in Athens.
 In the inaugural Olympic Games, only two tournaments were played: men's singles and men's doubles.
 Women were allowed to start to compete in singles and mixed doubles tennis events at the Olympic Games in 1900.
 Between 1928 and 1988, tennis was not included in the official Olympic program.
 Demonstration tennis events were, however, held twice, first in 1968 and later 1984.
 It was reinstated as a medal sport in 1988.
Gustave François Lussi (June 2, 1898 – June 23, 1993) was a figure skating coach.
 His students include many champions, such as Dick Button, Tenley Albright, Maria Jelinek / Otto Jelinek, Donald Jackson, Alena Vrzáňová, Ronald Robertson, Ronald Ludington, Barbara Ann Scott, David Jenkins, Hayes Jenkins, Emmerich Danzer, Dorothy Hamill, John Misha Petkevich, and John Curry.
Basque Pelota was a demonstration sport at the 1992 Summer Olympics in Barcelona.
 It was the fourth and last time that the sport was included in the Olympic program; it was an official Olympic sport at the 1900 Games in Paris, and a demonstration sport in 1924 and 1968.
Triathlon has been an Olympic sport since its debut at the 2000 Summer Olympics in Sydney, Australia.
 Its inclusion in the Summer Olympic Games program was the quickest of any sport: the International Triathlon Union (ITU) was founded in 1989 and five years later, on 4 September 1994, triathlon's Olympic status was approved by the 103rd International Olympic Committee Session, in Paris.
 The variant contested at the Olympics (called "Olympic distance") is composed of a 1500 m swim, followed by a 40 km bicycle race, and a final 10 km run leg.
 The distances were chosen based on the toughest events from each of the sports that constitute triathlon.
Taekwondo is an Olympic sport that is contested at the Summer Olympic Games.
 It was introduced in the 1988 and 1992 Olympic Games as a demonstration sport, and made its debut as a full medal sport at the 2000 Summer Olympics in Sydney, Australia.
 Both men and women compete in four events each defined by separate weight classes: flyweight, featherweight, middleweight and heavyweight.
 Traditionally, taekwondo competitions consist of eight weight classes for each gender, but Olympic taekwondo only have four due to the International Olympic Committee (IOC) limiting the total number of taekwondo entrants to 128.
Olympic sports are sports contested in the Summer and Winter Olympic Games.
 The 2016 Summer Olympics included 28 sports, with five additional sports due to be added to the 2020 Summer Olympics.
 The 2014 Winter Olympics included seven sports.
 The number and kinds of events may change slightly from one Olympiad to another.
 Each Olympic sport is represented by an international governing body, namely an International Federation (IF).
 The International Olympic Committee (IOC) establishes a hierarchy of sports, disciplines, and events.
 According to this hierarchy, the Olympic sports can be subdivided into multiple disciplines, which are often assumed to be distinct sports.
 Examples include swimming and water polo (disciplines of aquatics, represented by the International Swimming Federation), or figure skating and speed skating (disciplines of skating, represented by the International Skating Union).
 In their turn, disciplines can be subdivided into events, for which medals are actually awarded.
 A sport or discipline is included in the Olympic program if the IOC determines it is widely practiced around the world, that is, the number of countries that compete in a given sport is the indicator of the sport's prevalence.
 The IOC's requirements reflect participation in the Olympic Games as well—more stringent toward men (as they are represented in higher numbers) and summer sports (as more nations compete in the Summer Olympics).
Basque Pelota was a demonstration sport at the 1968 Summer Olympics in Mexico City.
 It was the third time that the sport was included in the Olympic program; it was an official Olympic sport at the 1900 Games in Paris, and a demonstration sport in 1924.
 It would be included as a demonstration sport once again at the 1992 Games in Barcelona.
Dorothy Stuart Hamill (born July 26, 1956) is a retired American figure skater.
 She is the 1976 Olympic champion and 1976 World champion in ladies' singles.
The 1972 Prague Skate was a senior international figure skating competition held 11–12 November 1972 in Czechoslovakia.
 Medals were awarded in the disciplines of men's singles and ladies' singles.
 Gold in both categories went to skaters from the United States.
 Future Olympic champion Dorothy Hamill won the ladies' title ahead of West Germany's Gerti Schanderl and Canada's Daria Prychun.
 Gordon McKellen took the men's title while Zdeněk Pazdírek of Czechoslovakia and Jacques Mrozek of France took silver and bronze, respectively.

Question: Both Gustave Francoise Lussi and Dorothy Hamill were a part of what Olympic sport?
Answer: figure skating