Erector Spinae: The erector spinae is a muscle group of the back that includes three major muscles (iliocostalis, longissimus, and spinalis) responsible for extending and rotating the spine.
Spinal Extension: Spinal extension is a movement that increases the angle between the front parts of the body or straightens out a curve or angle in the spine.
Posture: Posture refers to the position in which someone holds their body while standing, sitting, or lying down, often related to alignment and support provided by skeletal and muscular systems.