Have You Ever Been Short of Breath

I'm constantly short of breath, especially during passing periods. It's not really because I walk slow or lazily . . . I usually tend to have a hard time of getting on time to this class once in a while. It's because my 4th Period is on the D building / 2nd Floor... and sometimes she keeps us in a couple of minutes. Anyways, another time I've been out of breath was last year during badminton practice when running up + down the stairs, the push-ups, stretches, running around the school, etc.