What is the largest muscle in the human body?

The gluteus maximus is the biggest muscle in the human body, by volume. The gluteal muscle group -- commonly known as the glutes -- includes 3 muscles located at the back of each hip. The glutes are the major components of each buttock. Gluteus maximus is the largest and most superficial of the gluteal muscle group, which also include gluteus medius and gluteus minimus. Gluteus maximus, along with the other gluteal muscles, serves many important functions. It stabilizes the pelvis and lower back, enabling an upright posture. It also has important roles in hip and thigh movements, and is a key player in powering walking, running and climbing.

The gluteus maximus does the job of keeping the whole human body weight. That's our largest muscle, which erects our posture. The gluteus maximus aids in walking up stairs and climbing.