A 35-year-old woman presents to your clinic 4 weeks after a…

A 35-yeаr-оld wоmаn presents tо your clinic 4 weeks аfter a motor vehicle accident (MVA). She reports ongoing neck pain and headaches, and you note hypertonicity in her neck muscles. During your examination, the patient demonstrates deep neck flexor endurance of 25 seconds and a Cranio-Cervical Flexion test (CCFT) with a 10-second hold at 22 mm Hg. Which of the following is the MOST appropriate initial intervention?