This is the NFL, with 46 man gameday rosters, you can't just play the 2nd team all over the place like in college or high school.
But I guarantee they are not going all out to win this game. It literally means zero. They can't change their seed for better or worse. They are going to go through the motions to get out of the game and move on to preparing for their playoff game. Expect a very conservative gameplan on both sides of the ball. A very basic approach.
A coach can sit up there all he wants and blow hot air but don't be fooled. Any player that is banged up and needs rest, will get the rest or get a lot of breathers during the game.