For more info, visit http://www.arnoldsportsfestival.com. The largest mixed gymnastics meet in the nation will welcome 4,000 youth participants in 2010. The 3 day competition regularly features performances by acclaimed U.S. Olympians including Blaine Wilson, Chelsie Memmel, and Paul and Morgan Hamm. The Arnold Gymnastics Challenge is directed by gymnastic star Tim Willson, a Columbus resident and a 4 year Varsity letterman for Ohio State Universitys Gymnastics Team. Willson was a member of the 1985 NCAA Championship Team, and on the 1985 and 1987 Big 10 Championship Team.