Does working out decrease your breastmilk production?

My baby boy is 10 weeks old and I want to continue breastfeeding for as long as I can. I barely made it to 6 months with my youngest daughter but I am determined to try longer this time. I really want to get back into running once the weather gets nicer but at the same time, I am hesitant to do so because I have heard working out decreases your breastmilk production. Has anyone experienced this?