This is the 10786th most frequent Russian word.
втянулся
"Got used to" or "got involved."
Here 'втянулся' is used figuratively to mean becoming accustomed or adapting to a new routine.
Он быстро втянулся в новый ритм работы.
He quickly got into the new work rhythm.
In this context, 'втянулся' expresses developing an interest and engagement in an activity.
Я втянулся в спорт после начала регулярных тренировок.
I got into sports after starting regular practice.
Here, 'втянулась' conveys becoming deeply involved or engrossed in an activity.