by choice; willingly; for the love of it
Used adverbially to emphasize that an action is done out of personal preference or enjoyment, not out of obligation. Often carries a nuance of 'going out of one's way to do it'.
彼は好き好んでこんな危険な仕事をしているわけではない。
He isn't doing this dangerous work by choice.
好き好んで早起きする人は少ない
Few people willingly get up early.
Reduplicative-like adverbial phrase from 好き (suki, 'liking') and 好んで (konomu, 'to prefer'), literally 'liking and preferring'.