A really easy way to glitch this achievement without even moving is to start a game and then sit down so that only your head and shoulders are visible in the little Kinect video feed in the bottom right. Just make sure you keep your hands by your ears and it should "see you". If not, move a little higher.
You'll know when you're in the right position because the calorie counter will be whizzing up at about 1cal per second. You'll get to each bonus round before the previous bonus round has even finished so you shouldn't need to swipe a single piece of junk!