Brachioradialis
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Brachioradialis is a muscle located in the forearm, that acts to flex the forearm.
Attached to the distal radius and the lateral supracondylar ridge of the humerus, its body can be made visible in certain types of flexion.
The brachioradialis is a stronger elbow flexor when the radioulnar joint (forearm) is in a midposition between supination and pronation. When the forearm is pronated, the brachioradialis is more active during elbow flexion since the biceps brachii is in a mechanical disadvantage. When the forearm is pronated, the brachioradialis tends to supinate as it flexes. In a supinated position, it tends to pronate as it flexes.
It is on the anterolateral side of the forearm, however is part of the posterior compartment and is innervated by the radial nerve.
If a person half-pronates their arm, to make a fist like they're holding a handled vessel of beer, then puts their fist under a table or desk and tries to flex at the elbow, the brachioradialis will stand out of the forearm, visible under the skin.
The comic strip character Popeye has pronounced Brachioradialis.
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