Examples:

• Come on, I'm as fit as a fiddle now.
• Leo seems to be as fit as a fiddle.
• Otherwise she is as fit as a fiddle.
• And you were as fit as a fiddle.
• Ah, little one, I am as fit as a fiddle.
• As fit as a fiddle.
• You'll be as fit as a fiddle.
• You'll be as fit as a fiddle in the morning.
• David seems to be as fit as a fiddle.
• Looks as fit as a fiddle.