Your skeletal muscles are attached to your bones by tendons, and they enable you to move around and maintain an upright posture. Some muscles, such as those that help you smile or flex your fingers, are only a few inches long, while others, like those in your thighs, are big and bulky.The answers depend on whether the muscles are measured by mass or by surface area.
"The gluteus maximus extends the thigh at the hip joint," Davies said."We use it when we get up from a chair, walking up steps or uphill. It needs to be powerful to move the weight of the entire upper body."Of course, training in sports that require ample glute power — like sprinting — can increase the size of the gluteus maximus. One small study found that the absolute volume of elite sprinters' glutei maximi was about 45% greater than that of sub-elite sprinters.
The latissimus dorsi, commonly called the"lats," are the largest muscles in the human body in terms of surface area, Davies said.
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