You might want to read and [url=http://pillarsofeternity.gamepedia.com/Athletics]that.

The second link might be considered as a mild "spoiler", as it tells you a list of locations where the skill is needed and several info about what it does. If you haven't been at "X", you might consider spoiler-ish to know what you shall be able to do and the possible outcome, so gentle warning, just in case.

You seem to demand pretty specific info, and unless someone powergaming here plays barbarian, I think you'll have more luck at the game's forums. I read more builds there, so you might want to read there.

But as my personal opinion, it is good to raise it for the RPG aspect and stuff like conversations (think about it as intimidate). It shall be useful in certain situations and it doesn't seem to be a bad idea to keep it high. But yes, if you only use it for fatigue and don't like to have fatigues members, obviously that is a bottleneck.

Thank you for the reply. Even though it doesn't answer my question, I will raise it. Currently I have it at 6.