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Arm muscle signal

As shown in the figure:

The upper arm muscles mainly include biceps brachii, triceps brachii and triceps brachii. The circumference of the upper arm depends on the development of biceps brachii and triceps brachii.

Biceps biceps brachii, also known as biceps brachii, as the most important symbol of male sexiness and strength, is also one of the appraisal standards of male charm in the animal kingdom, and is the top priority of many people's training.

This part is the largest muscle of the upper arm, which constitutes the shape of the upper arm. As the name implies, it has two heads, and the lower biceps are vaguely divided into two strands. The outside is a long head (green part) and the inside is a short head. The length of the two heads is different, and the attachment point of the proximal end is also different, so there are some differences in function.

The proximal tendon of the long head bypasses the humeral head and attaches to the supraglenoid tubercle of the scapula, while the proximal end of the short head attaches to the coracoid process of the scapula, and the distal ends of both heads attach to the radial tuberosity around the forearm and the aponeurosis of the biceps brachii.

Extended data

Because the long head of biceps brachii moves a lot in the early stage of contraction, that is, before the arm bends upward, it is very important to put the weight at the bottom as much as possible in this process. "Reclining and bending" is a good choice, because putting your arms behind your body can stretch your long head and give it more space to be highly active when bending.

The training principle of short head is a bit special, that is, let the long head fail and the burden falls on the short head. Choose some actions to make the long head contract from the beginning. For example, "the missionary bends down", which makes the shoulders in a state of flexion, so the long head becomes shorter and the shortened long head is inactive, which is conducive to increasing the training of the short head.