The City's annual Shape Up Somerville/ Somerville Recreation Road Race will expand for its 5th annual race, jumping from a 2.7-mile road race to a fully-certified 5K. On Sunday, April 13, starting and ending at the Somerville High School concourse, events will begin with a 1-mile children's "Fun Run" at 10:30 a.m., followed by a 5K race at 11a.m.