Final answer:
For a client with excessive anterior pelvic tilt, the cat (flexion) phase of the cat-camel movement should be emphasized to help counteract the tilt by stretching tight hip flexors and strengthening weakened abdominals and hamstrings.
Step-by-step explanation:
For a client with excessive anterior pelvic tilt, the phase of the cat-camel movement that should be emphasized is A) Cat (Flexion). This is because flexion involves an anterior bending of the vertebral column, which can help in correcting an anterior pelvic tilt by engaging the muscles necessary to reduce the tilt. Anterior pelvic tilt is characterized by an increased arch in the lower back due to an extended hip position; emphasizing flexion helps in stretching the tight hip flexors and strengthening the abdominals and hamstrings that are typically weakened by this condition.
The camel phase involves extension, which would further accentuate the anterior pelvic tilt and should therefore not be emphasized for these clients. Neutral spine and lateral flexion are not directly related to correcting anterior pelvic tilt, although maintaining a neutral spine during exercises is essential for overall posture alignment.