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Given Gigi was deliberately doing cartwheels bridges and splits during her 3D debut, and doing this on stage, it's entirely possible she's been putting effort into getting in shape.
Just like most other Holomem have been, Botan looks 20 years younger with her weight loss, Dev_Is are all dieting heavily. Haachama, Kronii, Mori, etc. It's very common, they need strength flexibility and stamina for what they do.