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]
(..) I had no idea I meant so much to her. Her vision and ours will be realized. And in her memory, we will all find the strength Snow's in his mansion. Where is that? That's us. That's the city circle. It's at least (..)2015 The Hunger Games: Mockingjay - Part 2