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Has anyone ever told you, "Stand up straight!" or scolded you for slouching at a family dinner?
有沒有人曾經告訴過你：“不要彎腰駝背！”亦或是因為你在家庭晚餐的時候肩背佝僂而受到訓斥。
Comments like that might be annoying, but they're not wrong.
但所謂忠言逆耳，他們并沒有錯。
Your posture, the way you hold your body when you're sitting or standing,
姿勢，也就是你掌控自己身體的方式，例如坐姿和站姿
is the foundation for every movement your body makes,
不僅是你肢體做出每個動作的基礎，
and can determine how well your body adapts to the stresses on it.
也能決定你的身體能承受多大壓力。
These stresses can be things like carrying weight, or sitting in an awkward position.
這些壓力可能來自于重物的搬運或者不正確的坐姿。
And the big one we all experience all day every day: gravity.
還有一項每天都在影響我們的：萬有引力。
If your posture isn't optimal, your muscles have to work harder to keep you upright and balanced.
如果你的姿勢不標準，你的肌肉需要更緊繃來保持身體的直立與平衡。
Some muscles will become tight and inflexbile. Others will be inhibited.
一些肌肉將會變得緊繃而且僵硬。還有一些會被拘束從而讓人不自在。
Over time, these dysfunctional adaptations impair your body's ability to deal with the forces on it.
隨著時間流逝，這些功能失調將會減弱你身體對外來壓力的抵抗性。
Poor posture inflicts extra wear and tear on your joints and ligaments,
不良的姿勢會給你的韌帶和關節增加額外負擔，從而撕裂它們，
increases the likelihood of accidents, and makes some organs, like your lungs, less efficient.
也會增加事故發生的可能性，同時讓某些器官，比如肺的工作效率降低。
Researchers have linked poor posture to scoliosis, tension headaches, and back pain,
研究證明，不正確的姿勢可導致的癥狀有：脊柱側凸神經緊張性頭痛以及背疼，
though it isn't the exclusive cause of any of them.
盡管不良姿勢并不是這些癥狀的唯一誘因。
Posture can even influence your emotional state and your sensitivity to pain.
姿勢甚至可以影響你的精神狀態以及你對痛覺的敏感度。
So there are a lot of reasons to aim for good posture.
所以保持好的姿勢是很必要的。
But it's getting harder these days.
但最近保持好姿勢越來越難了。
