Fit as a fiddle

Meaning

To be in excellent physical condition or perfect health. It is a happy, rhyming way to say you are feeling great.

Cheerful, healthy

Used in a sentence

• Grandpa is eighty, but he is as fit as a fiddle.
• After three weeks of training, I'm feeling fit as a fiddle.
• He recovered from the surgery and is now as fit as a fiddle.