跑 + (Modifier) + 步
步 (bù) serves as the noun component in the separable verb 跑步 (to run/jog). When 跑步 is split, 步 functions as the object of 跑, allowing modifiers and aspect particles to be inserted between them. Understanding this separation is key to using 跑步 correctly in complex sentences.
今天跑的步比昨天多了两公里。
jīntiān pǎo de bù bǐ zuótiān duō le liǎng gōnglǐ.
I ran two more kilometers today than yesterday.
你每天跑多长时间的步?
nǐ měitiān pǎo duō cháng shíjiān de bù?
How long do you run each day?
他跑了一会儿步就觉得累了。
tā pǎo le yíhuìr bù jiù juéde lèi le.
He ran for a little while and already felt tired.