I'm a new GM. With friends, we had two sessions, and after each of them, I've let them roll for skills increase. But recently one of them asked if he should roll for STR because his character is weak and despite that managed to force doors and a chest.
My first thought was "It's logical" but later I started to think about other stats, like "You can't simply increase your character Size", so I've said that I don't really know and I'd try to find out before next meeting.
I've found similar questions about Power, but it didn't help with my doubt.
So should I let him try to increase this or other stats?