Examples:

• You're fine, fit as a fiddle.
• Fit as a fiddle, as a rule.
• Come on, I'm as fit as a fiddle now.
• I'm fit as a fiddle and ready for love
• Leo seems to be as fit as a fiddle.
• Otherwise she is as fit as a fiddle.
• You need to be fit as a fiddle to produce masterpieces.
• And you were as fit as a fiddle.
• They're fit as a fiddle and ready to fly.
• Well, anyway. Nicholas is fit as a fiddle.