Hi
I am not an expert and I'm just talking with my experience. I think you developed stiff neck initially when you started exercising for that part of your body. And it disappeared after 10 days after your neck was habituated with those exercises. And a major part of the credit goes to the diet you are following. Lots of fruits and vegetables give you lots of fibre. It also helps to loosen the body and give it flexibility. Just my opinion.
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