I think it is because her sister Arielle had started gymnastics. She taught Gabby some of the skills and she was instantly in love. They begged their mom and it took a while but she eventually put her in a class. The first day the owner told her mom she needed to move up and come 3 days a week instead of 1.
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I'm assuming you are talking about Gabby Douglas. She didn't quit, however she took a post-Olympic break which is common, especially when you win Gold in the team final and all around final.