There are three main body types - endomorph, mesomorph, and ectomorph - determined by genetics. Endomorphs have larger bones and more body fat, mesomorphs have broad shoulders and lean muscle mass, and ectomorphs have a thin linear build. Mesomorphs tend to have an easier time controlling their weight due to a fast metabolism. In addition, there are five classifications of body shapes - V-shape, hourglass, apple, pear, and rectangle - defined by the proportions of the upper and lower body sections.