This weekend, hundreds of Washingtonians stripped down to their skivvies for a one mile-ish “fun run” in the city. The annual Cupid’s Undie Run took place on Saturday, as participants raised money for the Children’s Tumor Foundation and neurofibromatosis research.

Founded in the District, the event popped up in 37 other cities this year.

Not only did DCist readers snap photos, but the Real United States blog caught the enthusiastic runners in action this year.