3 sentences

1. 由于用力过度，他腿上的筋拉伤了。

   yóu​yú yòng​lì guò​dù, tā tuǐ shàng de jīn lā​shāng le.

   He strained a tendon in his leg due to overexertion.

   Source: Dong Chinese Dictionary

2. 这些豆角太老了，里面的筋都嚼不动。

   zhè​xiē dòu​jiǎo tài lǎo le, lǐ​miàn de jīn dōu jiáo bù dòng.

   These green beans are too old; the fibers inside are too tough to chew.

   Source: Dong Chinese Dictionary

3. 他一激动，额头上的青筋就露了出来。

   tā yī jī​dòng, é​tóu shàng de qīng jīn jiù lù le chū​lái.

   When he gets excited, the veins on his forehead stand out.

   Source: Dong Chinese Dictionary