Why およぎ is turned into およぐ

Hello, new here, but I am wondering why およぎ is turned into およぐ in this sentence? What is the rule behind this?

彼女はおよ泳ぐのがじょうず上手である。

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Probably worth skimming through a grammar guide ( Polite Form and Verb Stems – Learn Japanese )

およぎ ー swimming

およぐ ー swim (or “to swim”, if you prefer your verbs like that)

In general, Japanese verbs end with an う sound, and various conjugations change that う to あ, い, お, or え, so for ぐthat would be が, ぎ, ご, げ. For example “not swim” would be およがない, with the が form plus ない, “let’s swim” would be およごう, with the ご form plus う, and the polite form would be およぎます, with the ぎ form plus ます.

For the -ing form, it’s the い sound with no additions:

泳ぎ - swimming.

走り - running.

歩き - walking.

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