Are neck sprains common when doing muscle ups? What muscles need to be strengthened to avoid this? I recently started working on my muscle ups. I can do two with a kip. Every once in a while I end up with soar / sprained neck on the left side the next morning. I know my form is decent, I record myself a lot to make sure I'm doing things right. I don't chicken wing, and I keep my elbows tucked in. My kip isn't that aggressive and now only do 3-4 sets of 2 each workout until I perfect the form and eliminate the kip. 

I have a weakness somewhere that I need to work on, as is with every other injury I had. I had issues with shoulders, elbows, and wrists previously that have all been fixed with simple strengthening exercises.

Where can I start to fix this?