USA Gymnastics
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USA Gymnastics (USAG) is the national governing body of gymnastics in the US. The programs governed by USAG are: Women's Artistic, Men's Artistic, Rythmic, Trampoline & Tumbling, Acrobatic, and Group gymnastics.
Women's Artistic is by far the most popular program. Gymnasts of all ages compete in levels 4-10, and then move on to Elite.