Of course, due to the possibility of previous injuries, pre-existing conditions, or other contraindications, clients should have physician approval prior to performing neck strengthening exercises. On the other hand, we are unaware of any injuries in our facilities over the past 20 years resulting from use of our neck machines. In fact, most of our members, program participants, and research subjects would agree that they have experienced more benefit from the neck and back exercises than from any of the other strength training components.