From the latin flexĭo, bending is the action and the effect of bending his body or one of its members. It is a motion of approximation between the parts of the body by the action of the muscles.
Muscle Flex allows to approach the forearm of the arm, for example. Contrary to the flexion movement is the extension. In this case, a distancing occurs between bones or parts of the body.
Flexion of the arms, bending elbows (also says 'make the pumps' in popular parlance) is a physical exercise very common to develop the pectoral muscles, triceps, deltoids, the serratus muscle and coraco-brachial. The activity also helps improve the anaerobic resistance.
To achieve this kind of flexing, the person must bend downward with the Palm of the hand pressed on the floor at shoulder height. Then, it must lift his body with the force of his arms and kiss again (to resume the original position). Thus, the arms are bent and drawn alternately. For those wishing to increase the difficulty of the exercise, just make the bends with a single arm or add weight on the back.
Mechanical bending, on the other hand, means the deformation suffered by a structural element expanded in direction perpendicular to its longitudinal axis. Beams, plates, and the plates are examples that support multiple levels of mechanical flexion.
For Linguistics, last, flexing is the change experienced by some words by the morphemes of which they consist that can express several functions within the sentence. These alterations affect the agreement and the dependency between several elements of the sentence.