fit as a fiddle
身体健康的，精神状况良好的
口语·表达健康状态
英文释义
in excellent physical health
例句
After a week of rest, I feel fit as a fiddle and ready to run a marathon.
典故来源
源自16世纪，小提琴需调音至最佳状态，比喻身体极佳。