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The evolution of Cedric's physique happened at the same time he was immersed in the sea of laws...Light Laws, to be more specific.
Through his clone's eyes, Cedric watched as the Great Law of Light manifested before him, becoming clearer and clearer until he was finally able to make sense of it. And once this process began, it couldn't be stopped.
At the same time, great changes were happening to Cedric's main body because of the miraculous effect of the Sacred Light Fruit.
His body was sublimating in a way he never thought possible before. Cedric never thought that his physique could still improve since, in his opinion, it was already as strong as it could, but he was proven wrong.
Truly, the standards of the Primitive Universe were higher than what he imagined them to be.