Generally speaking, the arm circumference refers to the straight arm circumference of human beings, that is, how thick the thickest part of the upper arm is when the arm is straight. It is difficult for people who are not fat and do not exercise regularly to exceed 30cm；; And about 35 cm is the "macho man" in social average cognition; The gym 45 cm is also the top boss. In some gyms, there is the privilege of "putting equipment everywhere"; Only a few talented, hard-working and resourceful people can practice their arm girth above 50 cm, which is the level of most bodybuilders. For example, Schwarzenegger's arm circumference is 55 cm. Therefore, it is necessary to doubt whether this anthropoid creature with an arm circumference of 80 cm belongs to humans. The elbow circumference of this creature must be more than one meter, which is thicker than many people's waist; Its hook strength will exceed half a ton, and a slap in the face can blow the heads of ordinary people out. The closest thing to this data in nature should be gorillas.