What characterizes a neutral pelvis?

A neutral pelvis is characterized by the alignment of the anterior superior iliac spines (ASIS) and the pubic bone in the same coronal plane. This position ensures that the pelvis is neither tilted forward (anterior pelvic tilt) nor backward (posterior pelvic tilt), creating a stable foundation for the spine and the rest of the body during movement and exercise. Achieving this neutral alignment is fundamental in Pilates, as it promotes proper posture and functional movement patterns.

When the ASIS and pubic bone are in the same coronal plane, it means that they are level with each other and not skewed to either side, leading to better engagement of the core muscles and improved alignment of the spine. This position allows for better coordination in movement and helps in avoiding strain on the lower back, which is crucial for exercises performed on the reformer.

The other choices describe positions that are not characteristic of a neutral pelvis. When the ASIS and PSIS (posterior superior iliac spines) are not aligned, it indicates a pelvic tilt. Anterior positioning of the ASIS relative to the PSIS suggests an anterior pelvic tilt, and a posterior position of the ASIS compared to the pubic bone implies a backward tilt, both of