What positions used iron man on the trombone?

The term "iron man" in trombone playing doesn't refer to a specific position. It's more of a slang term used to describe a player who is exceptionally strong and resilient, capable of playing for extended periods and with a lot of power. It's like saying someone is a "machine" or "built like a tank" in other contexts.

There's no particular position on the trombone associated with this term. Any player who demonstrates outstanding stamina and physical strength could be described as an "iron man."

However, you might be thinking of a different term: "Iron Mouth". This term is used to describe a trombone player who excels at playing high notes with clarity and precision. It relates to the strength and dexterity required to play those challenging notes consistently.