身子骨

由于长时间伏案工作姿势不良，他感觉自己原本挺拔的身子骨有些僵硬酸痛，必须起身拉伸运动。

yóu yú zhǎng shí jiān fú àn gōng zuò zī shì bù liáng, tā gǎn jué zì jǐ yuán běn tǐng bá de shēn zi gǔ yǒu xiē jiāng yìng suān tòng, bì xū qǐ shēn lā shēn yùn dòng.

Due to his poor posture while working at his desk for a long time, he felt that the bones in his originally upright body were stiff and sore, and he had to get up to stretch.

爷爷虽然已经年过八旬，但每天早起晨练，身子骨依然十分硬朗。

yé yé suī rán yǐ jīng nián guò bā xún, dàn měi tiān zǎo qǐ chén liàn, shēn zi gǔ yī rán shí fēn yìng lǎng.

Although my grandfather is over eighty years old, he still gets up early and does morning exercises every day, and his body is still very strong.