This is the 19286th most frequent Korean word.
않고도
"Without doing"
Here, "않고도" is utilized to indicate the ability to maintain health without performing the action of exercising.
그는 운동을 하지 않고도 건강을 유지한다.
He maintains his health without exercising.
The word "않고도" in this sentence refers to knowing the answer without engaging in the activity of solving the problem.
문제를 풀지 않고도 정답을 알고 있었다.
He knew the answer without solving the problem.
"않고도" is used here to show achieving success on the test without the prerequisite of studying all day.