See if you want to lose weight or build muscles. Both gaining muscle and losing weight can make you thinner. If you just want to lose weight, it is a treadmill and a fat skimmer. Lose weight after running. Dumbbells and traction devices are good if you practice muscles.
But I personally lose weight by running, that is, running on the road every day, then eating some fast and high-fiber meal replacement milkshakes, and then eating fruits and the like.