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]
(..) Is that a challenge? Temper, temper. I wouldn't dream of challenging you. Pity! Why not? Well, as far as brains go, I got the lion's share. But, when it comes to brute strength... I'm afraid I'm at the shallow end of the gene pool. There's one in every family sire... What am I going to do with him? (..)1994 The Lion King