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]
(..) - Mm-hmm. - Mmm... - Mmm... I need rest. I need food so I can regain my strength. Okay, what do you want? Umm... umm... some pancakes. Okay. And bacon. (..)2004 The Notebook