In which sport did Norwegian Marit Bjørgen become famous?

Marit Bjørgen (born 21 March 1980) is a Norwegian cross-country skier. She is ranked first in the all-time Cross-Country World Cup rankings with 114 individual victories. Bjørgen is also the most successful sprinter in Cross-Country World Cup history, with 29 victories. She headed the medal table at the 2010 Winter Olympics by winning five medals, including three gold. A five-time Olympian, her five Olympic medals at the 2018 Pyeongchang Games brought her total number of medals up to a record 15, the most by any athlete in Winter Olympics history.

On 6 April 2018, Bjørgen announced her retirement from cross–country skiing following the 2017–18 season. In May 2020, she announced that she would return to competition with long-distance cross-country ski squad Team Ragde Eiendom, with a focus on competing in Vasaloppet in March 2021.

In 2015, Bjørgen announced that she was pregnant and would not compete in the coming season, aiming for a return in the 2017 season. Her first son was born on 26 December 2015. After having retired at the end of the 2018 season she gave birth to a second son in March 2019.