In Soviet times, she trained at
Dynamo in
Vladimir. Reztsova earned a total of five medals in the
Winter Olympics, including three golds (1988: cross country 4 × 5 km relay, 1992: biathlon 7.5 km, 1994: biathlon 4 × 7.5 km relay), one silver (1988: cross country 20 km), and one bronze (1992: biathlon 3 × 7.5 km relay). She was notable for performing the feat of being the only person to win Olympic gold medals in both cross-country skiing and biathlon. She was one of the few sportspersons to win gold at three consecutive Olympics under three different flags, the first being the
Soviet union in 1988, the second –
Unified Team in 1992, and the third being the
Russian Federation in 1994. Reztsova also found success at the
FIS Nordic World Ski Championships, earning three golds (4 × 5 km relay: 1985, 1987, 1999) and two silvers (1987: 5 km, 20 km). She also won one cross-country World Cup and seven biathlon World Cups in her career. In an interview with a Russian sports website in 2020, she admitted to having used illegal performance-enhancing drugs at the end of her career. During the
2022 Russian invasion of Ukraine, Norwegian biathletes wanted Russian athletes to be excluded from international competitions. This made Reztsova claim that Russian athletes would always be better than the Norwegians, claim that Norwegians just wanted to get rid of competitors, and liken Norwegians to "disgusting cockroaches". ==Personal life and death==