go the extra mile

[at a cookie shop]

Wow, you did a fantastic job baking. Everyone is enjoying your new cookies. You really went the extra mile.

　Yeah, it took a big effort but I enjoyed it.

[クッキーショップにて]

わぁ、このクッキーすごいよくできてる！みんな、新しいクッキー美味しそうに食べてる！

本当によく頑張ったね〜！

　すっごい労力だったけど、楽しかったよ。

▷ 「go extra mile」は "より一層頑張る"といった意味で使われます。