The 'kiss the sky' exercise strengthens and improves neural control over internal neck muscles, potentially making nasal breathing easier.

“the to exercise the internal muscles of the neck and the way you do this is something called kiss the sky the boxers will actually know this the old school boxers it looks ridiculous but I'll do it cuz I look ridiculous on this podcast all the time intentionally so you look up at the sky and you pucker like you were a puffer fish oh for 15 seconds per side interesting and she said it builds the the muscle the the mus the strength and the neural control over the internal muscles of the neck so again no widening or thickening of the neck but on the inside and it makes it much easier to take deep breaths through your nose it probably increases the amount of resistance so that you can fill your lungs more easily”