Lateral flexion refers to the bending or tilting of the body or body parts sideways, away from the midline. It involves moving your head, neck, or trunk to the side, either left or right. Full definition
The researchers this time compared a number of exercises that utilised the upper - body weight as leverage including static inverted row, L - sit, trunk extension (static horizontal back extension), static lateral flexion of the trunk (static horizontal flexion). (strengthandconditioningresearch.com)
This is another prime example of resisting lateral flexion, and a great drill for strengthening the lateral line that Thomas Myers often refers to in his work, Anatomy Trains. (weckmethod.com)
Stretching exercises for the neck including rotation stretch, forward and lateral flexion stretches and Sternocleidomastoid stretch. (sportsinjuryclinic.net)