Recently i noticed i have been yawning excessively. i am a runner but haven't been pushing myself too hard. i also seem to be a little short of breath but it hasn't affected my running yet. what might this be?

See your doctor.: Make sure that you're getting enough sleep but that seems rather obvious for the yawning. Anything that causes you to be short of breath especially with exertion needs a thorough workup with your physician. Contact your physician for evaluation of shortness of breath.

See a Dr.: Hard to say, but if your immune system is compromised, you should see a dr. And rule out what it might and might not be.