Chinese · Pronunciation Guide
ün-DOONG, both syllables dropping hard. The first vowel is the rounded front ü, written as a plain u because a syllable cannot start with bare ü.
yùndòng
Both syllables plunge, with the first compressed and the second fuller — the usual asymmetry in a double-falling pair. The word also contains a nasal contrast: yùn closes at the teeth ridge and dòng at the back of the mouth, which is easier to feel here than usual because the vowels are so different.
Listen: 运动
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我一个星期运动三次。
Wǒ yí ge xīngqī yùndòng sān cì.
I do sports three times a week.
Listen: 我一个星期运动三次。
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我一个星期运动三次。 opens with wǒ keeping its dip, since 一 has converted to a rising yí before the underlyingly-falling ge. Then xīngqī gives two level syllables, yùn and dòng both plunge, sān holds level, and cì plunges again. Three descents and three plateaus, alternating.
The ü is replaced by a plain "oo" for most learners, giving "woon" — the tongue must stay high and forward while the lips round. Aspirating the d gives tòng. And the two nasals get merged, so the syllables end up rhyming when the first should close at the front and the second at the back.