Arm Stretching - Elbow Extension.

Muscles involved: Biceps brachii

Instruction:

Stand before a mirror stretching the elbow and force the pronation of the forearm with your other hand to further separate the points of insertion of the heads of the biceps.

Commentary:

This exercise might look simple, but the biceps does not require more demanding stretches, as it works well within the regular ranges of motion, and rarely encounters abnormalities in its mobility – which  are much more frequent with many other muscles.