1. fit as a fiddle - Adjective
2. fit as a fiddle - Phrase
fit as a fiddle (not comparable)
(simile, colloquial) Perfectly fit; in excellent condition or health.
The room where I am lodging is stupendous. Thank God I am as fit as a fiddle. Pietro Mascagni
Even the president, assuming he is still as fit as a fiddle as his spokesmen say, has seemed lost. Source: Internet
“I had it and I’m 100 per cent recovered and fit as a fiddle. Source: Internet
It is unbelievable that he is just one year younger than Baba, but looks 10 years younger, even though Baba himself is still going strong and looking as fit as a fiddle. Source: Internet