I have daily and severe episodes of yawning followed by the need for a full breath as If my lungs are not expanding to take all the air in. I am 44, female, 5.4" and weigh 127 pounds.  I do 45 minutes cardio/strenght training/yoga and kick boxing 4 days a week.
HIT his could be an asthma problem, and you need to see a doctor for and exam and spirometry (breathing test/lung function test)