Previously, Kostornaya switched from single skating to pair skating. There she began to play with Kunitsa.
Until the 2020/2021 season, the athlete worked in the group of coach Eteri Tutberidze, then joined the Angela Plushenko Academy for a year, but returned before the end of the season. In March 2022, Alena again changed her mentor to join CSKA in the group of Elena Buyanova.
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