Biggest Loser celebrities Sean Algier and (well, probably) Danny Cahill will run this 5K/1-mile fun run combo to encourage healthfulness and show of their new, hot bodies, and they totally don't mind if you come along. Registration is $20, or $25 the day of the race; children 18 and under race free. <a href="http://www.tulsarunner.com/race-calendar/">Register for the Riverside 5000 here</a>.