The waist/hip area of the body; used to refer to posture, stance, or the position/pose of the body. Can also imply one's bearing or attitude in context.
試合前にコーチは選手に低い腰の構えを指示した。
Before the match the coach instructed the players to adopt a low stance.
腰の位置を意識して動くと、体のバランスがよくなる。
If you move while being aware of your hip/waist position, your balance improves.
写真は彼女の腰の角度と全体のポーズが美しく撮れている。
The photo beautifully captures the angle of her waist and her overall pose.