This is the 687th most frequent Korean word.
강하게
"Strongly" or "firmly."
Here, '강하게' describes the intensity of the subject's determination ('마음을 먹는다').
그녀는 늘 마음을 강하게 먹는다.
She always resolves strongly in her mind.
In this sentence, '강하게' describes the resulting state of the body, indicating increased strength.
이 약은 몸을 더 강하게 만들어 줄 거예요.
This medicine will make your body stronger.
In this sentence, '강하게' means 'strongly' and modifies the verb '견뎠다 (endured)', describing the manner in which he endured.