All people with Down syndrome have an extra, critical portion of chromosome 21 present in all or some of their cells. This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome. Although 5Ks are usually 3.1miles, our run will have an extra, optional .11 miles, making our 5K a 3.21 mile run- to celebrate the extra chromosome, hence "with a little extra". Over the years we have expanded our 5K to include a 10K and Half Marathon- all with a little extra!