My body is constantly changing, because of the relationships between my arms and my head. My muscles are moving.

我的身体在不断改变，因为我的胳膊和脑袋的关系。我的肌肉在动。

youdao

Make as many funny faces as you can to exercise all of your facial muscles massaging any other tense head areas like your temples, forehead, eyebrows, and scalp.

尽量做出最多的滑稽表情因为你可以锻炼你所有的脸部肌肉并按摩其它头部紧张的区域如鬓角，前额，眉毛，和头皮。

youdao

Your breathing, blocked by stress, will improve. Your muscles will relax and, most importantly, your head will be emptied of all worries.

被紧张堵住的呼吸会慢慢顺畅，你的肌肉会放松下来，最重要的是脑海里将没有忧虑。

youdao

They also can become weak, expel material from the stomach, and suffer pain in the head or muscles.

VOA: special.2010.04.20

My body is constantly changing because the relationships between my arms and my head and so forth. My muscles are moving.

我的身体在不断改变,因为我的胳膊和脑袋的关系等等,我的肌肉在动。

耶鲁公开课 - 死亡课程节选

They also can interfere with mental ability,make muscles weak and cause pain in the head.

VOA: special.2010.07.27

Mouth: Disagreement also shows up in compressed or pursed lips, clenched jaw muscles, or a head turned slightly away, so eye contact becomes sidelong.

FORBES: The Body Language of Disengagement--and How to Deal With It

He tested his muscles, stroked his head thoughtfully, and felt the rest of his body: did he still have the strength for some powerful fame- and prize-winning action?

NEWYORKER: Among Animals and Plants

Typically, someone who is in agreement with you will smile and nod as you speak. (Disagreement shows up in compressed or pursed lips, clenched jaw muscles, or a head turned slightly away, so eye contact becomes sidelong.) But smiles are often used as a polite response and to cover up other emotions.

FORBES: Body Language Savvy for Sales