Pope Francis has told young people they are not called to be couch potatoes, living boring lives, but should leave their mark in history and not let others determine their future.

Like a football match, life "only takes players on the first string and has no room for benchwarmers," the Pope told young people at the World Youth Day prayer vigil. "Today's world demands that you be a protagonist of history, because life is always beautiful when we choose to live it fully, when we choose to leave a mark."