An impression of having seen or experienced something before: Old-timers watched the stock-market crash with a distinct sense of dÃ©jÃ  vu. b. Dull familiarity; monotony: the dÃ©jÃ  vu of the tabloid headlines.
Lateral Neck Flexion Stretch. Lateral neck flexion stretch targets the upper trapezius muscle. This stretch can be very useful for people who suffer from tight, aching muscles in the upper back and neck, such as those who work at a computer.his stretch can be very useful for people who suffer from tight, aching muscles in the upper back and neck, such as those who work at a computer.
Which is easy enough to picture at the elbow, flexion is when you move your forearm toward your upper arm and extension is when you move your forearm away from your upper arm. There has to be another definition for when the two bones are already perpendicular if that's the right word, though.f muscles in the back contract, they pull your arm back. What exercises make these muscles work? Pushups, pullups, rope climbing and throwing flex and extend the upper arms to work your anterior deltoid, coracobrachialis and pectoralis major, and your posterior deltoid, teres major and latissiumus dorsi.