Strengthening works, but you don’t have to be quite this badass. Unless you just want to be. This is the Iron Edge neck harness.
The evidence we have for longer term training is nothing but good news: lasting improvements in strength, pain, and disability. It still hasn’t been replicated, but it’s excellent preliminary data. For more information, see Ylinen et al, or a much more detailed new discussion in my neck pain book.
(By the way, this is yet another in a series of many updates about exercise efficacy. They just keep happening.)