Want to look thinner? Push your shoulders back, pull in your stomach, and tighten your buttocks. Voila!
You not only look thinner, you look and feel more confident. When you enter a room with good posture, people will notice and will treat you with added respect.
Standing up straight also helps to build your stomach muscles and the muscles in your lower back, which will make it easier to maintain that good posture.
Multitask: Look thinner while tightening those muscles and project confidence all at the same time.