全身 (quánshēn) means "the whole body" or "from head to toe." It is used to describe sensations, conditions, or actions that affect the entire body, as in 全身发抖 (trembling all over).
跑完马拉松后,我全身都在疼。
Pǎo wán mǎlāsōng hòu, wǒ quánshēn dōu zài téng.
After running the marathon, my whole body ached.
她紧张得全身发抖。
Tā jǐnzhāng de quánshēn fādǒu.
She was so nervous that her whole body was trembling.
泡完温泉,全身都暖洋洋的。
Pào wán wēnquán, quánshēn dōu nuǎnyángyáng de.
After soaking in the hot spring, my whole body felt warm and cozy.