Can You Say "Your Character Wouldn't Think of That" As a DM?

As a dungeon master we often have to make some hard calls during a session. But should those include telling a player their character wouldnt or couldnt do something they thought of? Can you tell a low inelegance character they wouldnt have a certain idea? Can you tell a low strength character they cant attempt a certain feat of athleticism? Are those even in the same category?  Obliteration Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/