Swim
Noun
およぎ
マイケルは魚よりも泳ぎが上手です。
Michael's swimming is better than the fish's!
カエルの泳ぎにあこがれて必死に平泳ぎをれんしゅうしていたら、手と足がほそ長くなりました。
I admired frogs' swimming so I frantically practiced the breaststroke until my arms and legs got longer.
泳ぎはあまり得意ではありません。
I’m not very good at swimming.
This is the noun version of the kanji swim, so it means swimming.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned this reading already so you should be able to read it!