The Better Business Bureau said it's receiving complaints about various fun runs being canceled with short notice and often without refunds.
In Cleveland, a themed run was canceled with just four days notice. An email was sent to participants, saying race officials could not provide a refund.
A race in southern California was also canceled with the same "no refund" email.
So the bureau has tips in case you're thinking of participating in a fun run.
First, make sure to your research. Check out the company's Better Business Bureau Business Review before signing up.
Also, understand the terms and conditions involved.
Many people don't read the fine print before agreeing to online documents.
And pay with a credit card, where charges can be disputed. Purchases made with a debit card or cash are final.