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 way they pick TV shows, they make one show. That show's called a pilot. Then they show that one show to the people who pick shows... and on the strength of that one show... they decide if they want to make more shows. Some get chosen and become television programs. (..)1994 Pulp Fiction