Participants of the St. Louis Undy RunWalk on March 23 tour a giant inflatable colon, part of the Big Colon Tour supported by Olympus. (Photo credit: Marta Payne)
Participants of the St. Louis Undy RunWalk on March 23 tour a giant inflatable colon, part of the Big Colon Tour supported by Olympus. (Photo credit: Marta Payne)