Now that the quarterback has recovered from his injury, this week the team will be functioning 'at full strength' again. [=the team will have all its players again]
We are negotiating from a 'position of strength'. [=from a strong position; from a position that gives us an advantage]
He didn't mean to knock you down; he just 'doesn't know his own strength'. [=doesn't realize how strong he really is]
(..) the League of Shadows fulfills its duty to restore balance to civilization. No. You yourself fought the decadence of Gotham for years... with all your strength... all your resources, all your moral authority. And the only victory you could achieve was a lie. Now you understand. (..)2012 The Dark Knight Rises
(..) - You made a serious mistake. - Not as serious as yours... I fear. Bane. Let's not stand on ceremony here... Mr. Wayne. Peace has cost you your strength. Victory has defeated you. Theatricality and deception, powerful agents to the uninitiated. But we are initiated, aren't we, Bruce? (..)2012 The Dark Knight Rises