The longus colli muscle, based upon it's comparative size, forms the bulk of the deep flexor muscles of the neck. Often those who sustain neck injuries receive trauma to these fibers. The issue becomes rehabilitation for the reduction of future problems. Incorporating this tissue as a regular part of your exercise regime is an important consideration in program design.
Consistently include deep neck flexor work on the Pendulum 4 and 5 Way Neck Machines by utilizing the last four holes on the 'neck cam', that is, either the 12th 13th, 14th or the 15th position. The movement is accomplished by placing your face on the pad as one would normally do. Once situated, the cervical muscles are contracted by beginning the exercise leading with the chin. By initiating the motion with the lower jaw the lifter will immediately feel the targeted flexor group. A terrific way to Get Strong.
The Pendulum Neck Machine with the Face Pad in the #12 Setting
The Pendulum Neck Machine with the Face Pad in the #15 Setting