Alan Webb will race in a non-elite relay in Florida.
The exhibit will run from April 7-May 11.
The Iowa race has hosted the U.S. Championships three times before, most recently in 2010.
With new leadership, a sold-out field and a new CEO, the LA Marathon appears to be back on the fast track.
Many roads and sidewalks are simply unsafe to run on.
The 40-year-old juggles family life with a full-time job and a full-time running habit.
Track specialists Molly Huddle and Sally Kipyego will make their half-marathon debuts on the women's side.
The Olympian was forced to withdraw from the Rock ‘n’ Roll New Orleans Half Marathon with the flu.
The Hansons-Brooks athlete has not run since November because of the ailment.
Kenyan Moses Mosop, second at Boston in 2011, also announces withdrawal from race.