TRUE or FALSE: Both the angle of the hip and spine change when the pelvis moves.

The statement that both the angle of the hip and spine change when the pelvis moves is true. When the pelvis shifts in any direction—whether it's tilting forward, backward, or laterally—it directly affects the positioning and angles of both the hip joints and the vertebral column. This interconnectedness is a fundamental principle in Pilates and body mechanics overall.

For instance, a posterior pelvic tilt will typically cause a decrease in the curvature of the lumbar spine and can also affect the angle at which the femur sits in the hip joint. Similarly, if the pelvis anteriorly tilts, it may increase the lumbar lordosis while also influencing the hip's angle. Understanding that these movements are synergistic is crucial for both practitioners and instructors. This knowledge helps in creating balanced, effective movement patterns and can aid in addressing issues related to alignment and flexibility.

The other choices do not accurately capture the universal truth of how pelvic movement influences both the hip and spine. Some may imply conditions that do not hold true for the general principles of anatomy and biomechanics as applied in Pilates practice.