So I was thinking almost by accident about Warriors and came up with the idea of pretty much "What if Warriors could lift or move heavy stones, logs, or fallen trees?" Why? What for?
The thief has "Lock Pick" to pick certain doors in the game. The mage can get spells that do this. But warriors have nothing. So what if some of the dungeons or crypts had a huge stone sitting on them (if the trap door is in the ground) or rolled up against them (if a door) ... and only a strong Warrior can move them? These dungeons are for the higher levels in the game, so you'd need a super huuuuuge strength to be able open some of them. In this situation, no theives could enter these dungeons, and no mages could either unless there was a Dragon shout with the power to move such stones.
There is some mechanic for trying to push things in the game like holding SHIFT while pressing the "Activate" button to push. And if you aren't strong enough, your character will grunt and step back and wipe his brow and act tuckered out and if you try to do it again but simply aren't strong enough, THEN it will tell you "This is too heavy for you, you need some more exercise first."
Then, if you play a wimpy thief or a measly wuss of a mage, the only way you'd ever get into that dungeon is to go find a strong beefy Warrior and befriend him with many gifts until he wanted to go Questing with you, and then you'd bring him here to open the door for you. Just like in real life.