When you talk about the KUNyomi of a river, you say, "It's kawa!"
training - more serious than 練習； more like for the army or kung fu
a lesson. Often used like this:
きょうくん に なった！('That taught me a lesson!')
You SAY kunyomi when you talk,
but you have to figure out the sequence of the words in your HEAD.
練習 訓練 研修