After 12 years of a happy marriage, Katerina finds out that her husband is unfaithful to her. He explains his affair by the fact that during the years of their life together, Katerina, a champion of Russia in tennis and a beauty, turned into a dull housewife and lost her past attractiveness. Katerina is crushed and humiliated, as she had sacrificed her career in sports for the sake of her husband and daughter. Katerina and her daughter go to stay at her parents’. She hopes to return her husband’s love, but she is sure for that that, she needs to put herself in order and lose weight.
To achieve her goal and also to earn for the living, Katerina tries to get a job of a fitness instructor in a fitness club where her only girlfriend Svetlana works. At the interview, Katerina convinces the manager to hire her for a trial period as a trainee. Now, our heroine has two months to prove to herself and the others that she is worthy of something. Her news life brings not only challenges but new friends too.