Shoulder-brachial circumference is called upper arm circumference, that is, the horizontal circumference of the thickest biceps brachii of the upper arm when the upper limb naturally droops.

To strictly analyze and evaluate physical fitness level, we should comprehensively measure shoulder circumference, chest circumference, waist circumference, hip circumference, leg circumference and height. However, it is difficult to obtain these data in large quantities. Although there is a big error in evaluating physical fitness level through upper arm circumference, it is easy to obtain data. By setting reasonable sampling conditions, as long as the data is large enough, the upper arm circumference can indirectly evaluate the physical fitness level.

According to statistics, the upper arm circumference is more than 35cm, which is already a very high level.

Upper arm circumference level:

The upper arm circumference above 45cm is basically the ceiling of amateur fitness enthusiasts, except for a few talented cattle people, the rest can't touch this circumference.

In 1980s, Stallone's First Blood series caused a sensation in China, relying on his 45cm arm. At that time, the arm of the extremely heavy manual workers in China was far less than 45cm. 45cm arms can dominate, and now it looks incredible.

Scientific and technological athletes, whose upper arm circumference is more than 45cm (after degreasing), belong to a fairly high level. In a large gym, being a head coach is completely convincing.