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]
(..) and remembered. And the Guardian said to the assembly: GANTHET: Stand tall, warriors. If we are to be Guardians, you are to be our strength. If you are to be our strength, these shall be your arms. HAL: But then, the unexpected. They called it an accident. (..)2011 Green Lantern: Emerald Knights
(..) The Guardians saw it all. The evil was too great to be left unchecked. And so they gathered the light. They knew of its variety and strength... ...and the light with the most power. But they sought their answer in the light of will... ...to form from it a weapon unequalled... (..)2011 Green Lantern: Emerald Knights