This is the 3685th most frequent Russian word.
тренировки
"Тренировки" means "training" or "workouts" in English.
'Тренировки' is in the nominative plural case, used as the subject of the sentence, referring to the concept of exercising or training.
Регулярные тренировки помогают поддерживать хорошую форму.
Regular exercises help maintain a good shape.
Here, 'тренировками' is in the instrumental plural case, indicating activities of practicing or training.
Я занимаюсь тренировками каждый день.
I engage in workouts every day.
In this sentence, 'тренировки' is in the accusative plural case, referring to organized training sessions.