Korean · Pronunciation Guide
un-dong. A rounded vowel under a bare onset, a forward n, and a ㄷ that voices after the nasal.
undong
Two blocks, and the word is nasal-heavy: two of its four consonant slots are nasals and a third voices because of one of them. Nothing here is aspirated or tensed.
Listen: 운동
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일주일에 세 번 운동해요.
Iljuire se beon undonghaeyo.
I exercise three times a week.
Listen: 일주일에 세 번 운동해요.
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일주일에 세 번 운동해요 uses the -하다 verb form, and 일주일에 taps its ㄹ forward, giving il-ju-i-re. The counting phrase 세 번 then arrives before the verb with no consonant changes at all.
Aspirating the ㄷ into 'un-tong' is the standard error with the plain series after a nasal, when it should be softly voiced. The other slip is under-rounding either vowel: ㅜ is high and ㅗ is mid, so they differ, but both need the lips genuinely forward.