Alla Grebennikova

Alla Grebennikova is a retired Russian breaststroke swimmer who won two medals at the 1970 European Aquatics Championships. She also competed at the 1968 Summer Olympics and finished fourth in the 4×100 m medley and 200 m breaststroke events.
She married a Bulgarian swimming coach, Georgi Kostadinov, changed her name to Kostadinova, and moved to Bulgaria. There she worked as a swimming coach and started competing in the masters category. Since around 2000 she returned to Russia and until 2008 was winning all Russian 200 m breaststroke titles. She finished second at the European and World championships in the same event.