Why would anyone want a smaller waist? For starters, the circumference of your waist correlates with your risk of metabolic disease, type 2 diabetes and obesity. So why would anyone not want a smaller waist?
For a competitive physique champion like myself, a small waist emphasizes a v-taper and can significantly enhance muscle proportions. For people who just want to get in shape, a small waist will help in giving you that hourglass figure.