Good decision.
Many young women are more comfortable training in shorts. Now they can be more comfortable while competing.
International guidelines state female athletes are to wear leotards that “must not delineate more than 2cm below the buttocks” or a full unitard that extends from hip to ankle.
GNZ allows gymnasts to wear “leg coverings” and is now allowing female athletes to wear “bike shorts” or “shorts”. …
Gymnastics New Zealand loosen leotard rules, female athletes can compete in shorts
Gymnastics Coaching.com 
I think the shorts are very athletic looking. It wouldn’t bother me in the least if that became the standard competition outfit. The bathing suite looks uncomfortable to me. The shorts also remind me of dance competitions, so another positive association.
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