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]
(..) As it is meant to. A spell of concealment... ...lies over this place, which means... ...our Enemy is not yet ready to reveal himself. He has not regained his full strength. Radagast, I need you to carry a message to the Lady Galadriel. Tell her we must force his hand. What do you mean? (..)2013 The Hobbit: The Desolation of Smaug