4 sentences

1. 你肩颈怎么这么僵硬？

   nǐ jiān​jǐng zěn​me zhè​me jiāng​yìng?

   Why are your shoulders so stiff?

   Source: OpenSubtitles

2. 她的笑容有些僵硬。

   tā de xiào​róng yǒu​xiē jiāng​yìng.

   Her smile was a bit stiff.

   Source: Dong Chinese Dictionary

3. 你的肩膀很僵硬。

   nǐ de jiān​bǎng hěn jiāng​yìng.

   Your shoulders are very stiff.

   Source: OpenSubtitles

4. 由于长期低头看手机，他的脖颈感到非常僵硬。

   yóu​yú cháng​qī dī​tóu kàn shǒu​jī, tā de bó gěng gǎn​dào fēi​cháng jiāng​yìng.

   Due to looking down at his phone for long periods, his neck feels very stiff.

   Source: Dong Chinese Dictionary