Several muscles in the body are rather heavy, most of them found in the the lower body. Muscles gain in mass and weight as they are developed, which is why muscle weight is often determined by body size, strength and even genetics or heredity. However, regardless of such considerations, several muscles in the human body can be classified as the heaviest due to their size and function.
Gluteus Maximus
The gluteus maximus, or buttocks muscles, are considered the heaviest and the largest muscle group in the body. This muscle extends from the rear of the hip at the rear portion of the pelvic structure and sacrum of the spine and connects into the ligaments along the side of the hips and thigh.
Latissimus Dorsi
The latissimus dorsi is the broad muscle found in the middle portion of the back and extends from the spine to the side of the rib cage. Because of its width, this muscle is also known as one of the heaviest and is responsible for upright support and movement of the arm and shoulder joint for forward and cross motions of the arm.
External Obliques
The external oblique muscles, located on the on the front of the body, are large abdominal muscles that extend from the middle portion of the abdomen around the side and tuck under the latissimus dorsi of the back and into the serratus anterior muscles covering the ribs. These muscles form our side profile and give us our waistline and the sides of that six pack so many of us desire to achieve.
Pectoralis Major
The pectoralis major, commonly known as chest muscles, may also become quite heavy depending on stature, physique and physical fitness of a given individual. The pectoralis major group covers most of the front of the chest, starting at the breastbone or sternum and connecting to the ribs, collar bone and upper arm bones.
