If you are “fit as a fiddle,” it means you are in great shape.
When the early North American settlers gathered for a barn dance, it was often an all-night session of dancing and romancing for the hard-working and socially starved farmers.
The local band of amateurs was led by the fiddler who needed great endurance and stamina to play until the cows came home.
This gave us the expression “fit as a fiddler,” which evolved into “fit as a fiddle.”
