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]
(..) Well, that was.... We won't last long in this car. Fache doesn't like to be eluded, even on a good day. We need to get out of sight. Christ, give me strength. You are a ghost. Christ, give me strength. Stealing in a house of God! You are an angel. Christ, give me strength. (..)2006 The Da Vinci Code