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How Muscles Keep Us Standing
https://cyvigor.com/article/what-muscles-control-while-standing
Standing, also known as orthostasis, is a complex activity that involves maintaining an upright position, supported only by the feet. While standing, the body is not static and exhibits constant dynamic adjustments to maintain balance. This is achieved through the coordinated action of various muscles, including the leg and hip muscles, abdominals, obliques, lower back, glutes, and sometimes the upper body muscles. The leg muscles, including the quadriceps, hamstrings, and calf muscles, play a crucial role in lifting, flexing, and straightening the body. The core muscles, such as the abdominals and erector spinae, provide stability and balance. Additionally, the anticipatory control of muscle length, rather than passive ankle stiffness, is essential to prevent toppling forward due to gravity. Understanding the complex interplay of these muscles during standing can provide insights into postural maintenance and balance.