Choosing their team early allows team Japan, the favourites, to do a lot of team building in advance of Rio.
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https://www.dailymotion.com/video/x4fpslv_20160610training-camp-bilingual_sport
Uchimura would like to continue through the Tokyo 2020 Olympics, but no longer do the AA. He thinks Kenzo could one day be the Japanese and World AA Champ.
Gymnastics Coaching.com 