The right answer is triceps.
To stretch the triceps, raise one arm over the head and keep it against the ear. Flex your elbow so that your hand goes down behind your head. With the other hand, grasp the elbow of the flexed arm, exhale and slowly pull the elbow behind the head. Do both sides.
Tip to stretch back the triceps: avoid making sudden movements.
The triceps brachii muscle (polyarticular muscle of the posterior part of the arm) is composed of three chiefs: the long portion, the vast medial, and the vast lateral one. This muscle is proximal to the shoulder joint and elbow for distal termination. Brachial triceps is the main extensor muscle of the elbow. The long portion of the triceps brachii also allows retropulsion and adduction of the arm relative to the shoulder. The latter later allows greater stability of the glenohumeral joint during abduction greater than or equal to 90 °.
