Muscle cells constitutes the tissue of the body and will execute the muscle contraction. Muscle cells are smooth, cardiac and skeletal. Each differs in the structure, function and the location inside the body. Together these cells play their own role which will support the posture and skeletal structure of the body. This will also assist in the blood flow, helping in digestion. This is due to the increase in the muscle stress. This will also involve increase in the proteins present in the muscle cells that make it larger. Few try for Muscle hypertrophy which is done through the weight-lifting for athletic reasons.