What is the starting position of short box/round back?

The starting position for the short box series in the round back exercise is indeed the neutral spine position. In this position, the spine maintains its natural curves, which allows for optimal alignment and stability. This is essential for engaging the core muscles effectively while performing the exercise.

Neutral spine provides a balanced foundation that supports proper execution of movements. It ensures that the pelvis is in a position where the lumbar spine is neither overly arched nor flattened, promoting efficient use of the deep abdominal muscles and pelvic floor.

Utilizing a neutral spine during the round back position allows practitioners to focus on the intended muscle engagement and mobility without compromising the integrity of the spine. This is particularly important in Pilates, where maintaining alignment and awareness of one's body is crucial for both safety and effectiveness.

In contrast, other positions like imprint spine or extended spine do not align with the goals of this specific exercise, as they alter the natural curvature of the spine, which can lead to insufficient engagement or even strain during movement.