Fit as a Fiddle
In good physical health.
In excellent condition, in blooming health.
Examples:
You may feel sick now, but after a few days of rest and plenty of liquids, you'll be fit as a fiddle.
Of course! I feel as fit as a fiddle today.
Origin
The origin of the expression is connected with string musical instruments, which need to be maintained in excellent condition and tuned to produce good sound when played.
Meaning from English-Bulgarian Dictionary:
Fit [fit]
Suitable, appropriate, as it should be.
Match / Correspond to, in harmony with.
Adjustment, fitting, adaptation, fitting, correspondence.
Fiddle ['fidl]
(Instrument similar to) Violin, fiddle, violinist (in an orchestra).
Play the violin, etc.
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