One tell that I find quite profitable is folded arms.
When an opponent slumps or leans back in his chair and folds his arms between hands, he’s in defensive and patient mode. Don’t expect this player to suddenly get inspired and play a weak hand for the excitement.
When this player leans forward and decides to play, it’s almost always a legitimate hand. The folded-arms type of player is content to lean back and wait.
Again: Don’t expect to see weak-starting-hands. — MC