Recent evidence supports that notion that the role of cervical stabilization exercises (specifically deep neck flexor exercises) is primarily to provide postural stability for the C-spine. I measure DNFer endurance with a biofeedback cuff, and once my patient has developed the proper form and demonstrated endurance (up to 10 mmHg change x 5-10 seconds x 5-10 reps), I may advance on to the cranio-cervical flexion test (although my experience has been that this is very difficult for patients to perform correctly, even if there is no history of cervical dysfunction!)