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]
(..) He's not a drifter. He's got his own house somewhere, not an apartment. - Why? - What he does with them takes privacy. He's in his thirties or forties. He's got real physical strength, combined with an older man's self-control. He's cautious, precise... And he's never impulsive. He'll never stop. (..)1991 The Silence of the Lambs