system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Where did MCU Iron Man and Captain America learn their H2H fighting skills?

In his first movie Iron Man had reasonable fighting skills but clearly normal level. Come Iron Man 3 he can take on multiple trained goons and in Civil War could just about hold his own against Bucky. In his first movie on Captain America had basic bootcamp training but is clearly operating on a higher skill level both in the movie and in the Avengers team ups. Where did they learn to fight like that?
gpt
Iron Man:

* has a custom AI companion constantly reviewing his performance and providing recommendations
* a lot of time on his hands to practice
* powered suit that can predict his movements, analyze his opponent, and guide his body to the most efficient defense/offense

Captain America

* Fought Hydra during WWII, gaining practical skills
* Brought back by SHIELD and trained in black-ops
* 'perfect' reflexes and mental capacity, and access to the best hand-to-hand combat instructors in the world for several years
* All his time was focused exclusively on training (he didn't have time for a girlfriend)