Before we left for the lake, I worked up a sweat playing this game. For a few blissful, steamy minutes, it slipped my mind that the temperature was hovering close to zero. I breathed some new life in our standby floor puzzles and laid down some ground rules for an indoor puzzle relay race. What you need: Two puzzles Kids (You can do two kids per team, or one, or three, or whatever you have.) A hallway, or place to do a short run. Rules Set the puzzle pieces at opposite ends of the room or hallway. Each team lines up on the opposite end from his or her own…