No they don’t.

You’re better off taking a few minutes to really relax your muscles in your next and back. Start by breathing in as deep as you can into your belly, then in the same breath, switch to your lungs, and breathe in as deeply as you possibly can until it hurts, and then exhale. Do that for a minute and then when you think you can’t possibly breathe in any deeper, breathe in deeper still.

If you do this for a few minutes and feel crazy muscle spasms in your neck and back, you need to start taking a lot more deep, relaxing breaths.