Conan's bruises healed quickly, thanks to his youth and the iron constitution of the barbarian.

"He has an iron constitution," said his trainer, Michael Stoute.

"All I know is that he has an iron constitution," Robbins said.

An iron constitution is required for 19 to 34-frame matches.

He soon realized that even his iron constitution could not stand the incessant strain which he was putting upon it.

His iron constitution is taxed to the utmost by the heavy strain upon it.

Rockefeller had originally been blessed with an iron constitution.

That, and Oktar's iron constitution, kept him alive for eight days.

The benefits of an iron constitution and a head like a granite boulder, I suppose, he thought dispassionately.

He had an iron constitution, it seemed, though he looked older than his years.