A closer look
Gluteus maximus muscles are objectively the largest and heaviest muscles in the entire human anatomy, evolved specifically to keep our torsos completely upright against the force of gravity and to allow complex bipedal locomotion like running and climbing; this massive slab of muscular tissue is the biological reason humans were able to hunt down prey across the ancient plains by simply jogging after animals until they collapsed from exhaustion, a glorious evolutionary heritage of endurance and strength that we now primarily utilize as a built-in organic cushion for sitting at a desk for forty hours a week while complaining about how our posture is rapidly deteriorating into the shape of a cooked shrimp
