The trait reads,"Your hours of meditation on inner perfection and the nature of strength and speed allow you to focus your thoughts to achieve things your body might not normally be able to do on its own. Select any Strength-, Constitution-, or Dexterity-based skill. You may make checks with that skill using your Wisdom modifier instead of the skill’s normal ability score. That skill is always a class skill for you."
I don't know of any Constitution based skills... Am I missing something here?
I think it's simply some rules language carry-over from 3.5 where I believe concentration was a Constitution based skill rather than being based on your caster level.
I do remember concentration being a con based skill in 3.5, I thought this might be what happened and just wanted to clarify. Thanks!
It might also be making sure that it covers anything new that comes down the pipeline. One of the issues with a lot of Pathfinder stuff is that new stuff arrives that isn't covered by the old feats. For example, some of the older abilities used the word "wizard" instead of "prepared arcane caster," which meant that witches and magi (when they arrived) were out of luck. (Spell Mastery, call on line one...)