Ok, so I decided to create a new character that was the opposite of my first.  Instead of a happy good hearted slightly alchoholic miner I made an evil magician that prayed to Dakkru.   He can  ace the SAT's but he cant run far at all without popping in an inhaler.  Basically, he NEEDS Endurance.  So I took him into the areana where my first char trained for endurance.  But surprise surprise I cant train him with anything there. 
So my question is, are there other npc that train the same skill or does my char just need to buff up his stats in something else, in order to be offered endurance training?