Yes. My MawMaw (that’s Texan for “Grandmother”) used to tell her six kids that working out cured a cold. She’d send them off for swim practice, or tennis, or basketball, or whatever, insisting that it would help shorten the illness. Probably, she just wanted to not be surrounded by six kids, but it’s a rule I’ve stuck by, and it’s served me well. Sometimes, a good run will help me breathe more easily. I also believe that running on day 0-1 of your period makes it more bearable for the remaining days. That being said, don’t run when you’re ACTUALLY sick… which I refuse to ever get… because, I’m stubborn.