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change of pace; change of mood; (mental) break (e.g. going for a walk); refreshment
散歩して気分転換をしよう。
Let's take a walk for a change of pace.
彼は音楽を聴いて気分転換を図っている。
He listens to music to give himself a mental break.
疲れた時は短い旅行が良い気分転換になる。
When you're tired, a short trip makes a good change of pace.