Carrie Tollefson is an Olympic runner, and has run Grandma's Marathon. She is also in our Women's Half Marathon Championship Vehicle for coverage of the race on June 22 for ESPN Radio 560 WEBC. With all the temperature changes, sometimes you are under the weather, is it ok to work out?

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In her web show C.Tolle Run, she asks some questions and finds out answers. She enlists the help of Dr. Angela Voight, M.D., who says it's okay to take a little time off and you don't lose anything, and if the sickness is in your head (runny nose, cold and you don't present fever) you can still get the benefit.

If you are sick with fever or stomach flu, don't work out, you might make yourself more sick. You may even spread the sickness.

Here's the episode: