Due to his regular exercising and proper diet, he is always fit and fine. They say he is
-
As fit as a bull
-
As fit as a gennie
-
As fit as a fiddle
-
As fit as iron
C
Correct answer
Explanation
'As fit as a fiddle' is the correct idiom for being in excellent physical health and condition. The comparison to a fiddle (a violin) suggests someone who is finely tuned and healthy. This is a common English expression for fitness. The other options ('bull', 'gennie', 'iron') are not part of this established idiom.