Lateral flexion is an exercise designed to warm up the neck. The exerciser tilts the head from side to side, stretching the vertebrae out to the left and the right, describes SportsInjuryClinic.net.
The goal of the lateral flexion exercise is to relieve tension around the trapezius muscles. When a person's trapezius muscle is tight, he suffers from a sore back and neck, says SportsInjuryClinic.net. This exercise is particularly beneficial for people who sit at computers for long periods of time. The exercise can be performed at any time by looking straight ahead and then leaning the head to the left or right, holding it for 10 seconds. The motion should be repeated on the other side to stretch the body out equally.