Spinal extension is movement around the axis in which direction?

Spinal extension involves moving the spine backward, which increases the angle between the segments of the spine. This movement occurs around the X axis, which represents a horizontal axis running from side to side through the body.

When discussing the direction of movement in relation to this axis, it is important to refer to positive and negative directions in terms of standard anatomical position. In this context, spinal extension is considered a movement in the negative direction along the X axis because the motion is moving the torso away from the neutral or anatomical position, effectively resembling the backward bending of the spine.

Understanding spinal extension this way helps to grasp broader concepts within biomechanics, particularly how the spine functions in various movements and how associated forces affect spinal stability and posture.