This is the 4306th most frequent Russian word.
атлетике
"Атлетике" means "athletics" in English.
'Атлетике' here illustrates the domain in which achievements were made, using the prepositional case to reference sports activities.
Моя сестра выиграла награды в атлетике.
My sister has won awards in athletics.
The word 'атлетике' is used in the prepositional case to denote engagement or involvement in the field of athletics.
Я занимаюсь атлетикой уже пять лет.
I have been practicing athletics for five years.
The word 'атлетике' appears in the prepositional case here as part of a general statement about athletics as a field or practice.