| Golgathar |
I have a Brawler and I'm considering taking a level of barbarian, and I was wondering if I would be able to use the Brawler's martial flexibility ability while raging. I'm not sure if using martial flexibility would be considered an ability that requires concentration.
The description does not mention anything about concentration being needed, just that it basically happens at will. But I was wondering how anyone really familiar with the rules would interpret it with rage.