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Just a word of caution…Do not perform any of the exercises on that link without a trainer, physiotherapist, doctor, lawyer, and neck rehabilitation specialist present.
Herb
CharlieFrancis.com
Damn, link is missing. Neck training is vastly underrated and more should be doing it in some form.
sounds like it must be a killer excercise 
On occasion I’ll get in a sit-up position and just do a “neck sit-up”. Good stuff.