Body proportion refers to the proportional relationship between the length of each part of the human body and obesity. Often include height, waist circumference, hip circumference, shoulder width and other indicators. Different body proportions will affect people's appearance, image and health. For example, the proportion of long legs and short trunk is easy to appear slender, but it is also easy to lead to excessive bending of the lumbar spine and increase the risk of lumbar injury; The proportion of short legs and long trunk is easy to appear bloated, but it also helps to balance the center of gravity and reduce the burden on the knee joint.