伸 + Body Part
The verb 伸 (shēn) means 'to stretch out' or 'to extend.' It is commonly used to describe extending a body part, such as 伸手 (to reach out a hand) or 伸腿 (to stretch one's legs). The body part typically follows directly after 伸.
她伸手从书架上拿了一本小说。
tā shēnshǒu cóng shūjià shàng ná le yī běn xiǎoshuō.
She reached out and took a novel from the bookshelf.
坐久了要站起来伸伸腿。
zuò jiǔ le yào zhàn qǐlái shēnshen tuǐ.
After sitting for a long time, you should stand up and stretch your legs.
小猫伸出爪子去够桌上的鱼。
xiǎo māo shēnchū zhǎozi qù gòu zhuō shàng de yú.
The kitten stretched out its paw to reach the fish on the table.