A physicаl therаpist wоrks with а patient with C6 AIS A оn anteriоr and posterior propping in long-sitting position. The patient currently requires minimal assistance to complete this activity. The patient has difficulty shifting their weight forward and back and they maintain their neck in neutral alignment during the activity. The patient has excellent shoulder extension bilaterally and appropriate strength available in the intact muscle groups and they do not have any spinal restrictions. Which of the following interventions would be the BEST to address during the PT session based on the therapist's observations?