Being in excellent physical health or condition.
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To be in very good health — strong, full of energy, and feeling great.
When someone is fit as a fiddle, they're in top shape, often after getting over an illness.
It's a cheerful old phrase that people still use today.
"Right as Rain"
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Completely well and back to normal after something went wrong
"In Good Shape"
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Physically healthy and in a strong condition, more neutral and modern
"Fit as a Fiddle"
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In excellent health and feeling strong