Posture
Attitude
noun
Put a force on your figure to make it into a certain shape. This is your posture.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
トーフグはいつも低姿勢なので、好感が持てます。
Tofugu always has a humble attitude, so I have a good impression of them.
クロッキーのクラスでは、モデルさんに色んな姿勢を取ってもらいました。
We had a model strike various poses for us during the sketching class.
たぶん姿勢が悪いから首がこるんでしょう。
Your bad posture is probably why your neck is so stiff.