4 sentences

1. 他起身向客人打招呼。

   tā qǐ​shēn xiàng kè​rén dǎ zhāo​hu.

   He stood up to greet the guest.

   Source: Dong Chinese Dictionary

2. 我不知道自己当时为什么起身。

   wǒ bù zhī​dào zì​jǐ dāng​shí wèi​shén​me qǐ​shēn.

   Why I got up when I did, I don't know.

   Source: OpenSubtitles

3. 医生建议他久坐后要起身直立行走几分钟，以缓解腰椎压力。

   yī​shēng jiàn​yì tā jiǔ zuò hòu yào qǐ​shēn zhí​lì xíng​zǒu jǐ fēn​zhōng, yǐ huǎn​jiě yāo​zhuī yā​lì.

   The doctor advised him to stand up and walk for a few minutes after sitting for long periods to relieve pressure on his lumbar spine.

   Source: Dong Chinese Dictionary

4. 我们明天一早起身去北京。

   wǒ​men míng​tiān yī​zǎo qǐ​shēn qù Běi​jīng.

   We are leaving for Beijing first thing tomorrow morning.

   Source: Dong Chinese Dictionary