Final answer:
During a pulling assessment, the sternocleidomastoid and the upper trapezius muscles may be overactive if the head juts forward. Strengthening opposing muscles and maintaining correct posture can help alleviate the issue.
Step-by-step explanation:
If the head juts forward during a pulling assessment, the muscles that may be considered overactive are typically the sternocleidomastoid and the upper trapezius. When the head and neck are not aligned over the body properly, these muscles can become tense and overworked to compensate for the imbalance. To correct this issue, it's important to strengthen the opposing muscles, such as the deep cervical flexors, and practice proper posture to help reduce the strain on the overactive muscles.