Definition: "in excellent condition"

This is an anagram - look for an indicator word that suggests mixing or rearranging letters

'Excited' is the anagram indicator - rearrange the letters of 'IF DATA FIELDS' to get your answer

Answer: FIT AS A FIDDLE | 'Excited' indicates anagram - rearrange the letters of 'IF DATA FIELDS' to get FIT AS A FIDDLE (in excellent condition)