Common methods to reshape and enlarge butts are Brazilian butt lift (using your natural fatty tissue) and butt implants.
Butts Implant- If you are lean and there is not much fat to harvest, butt implants help you to achieve the required butt size. However, there is associated risks such as capsular contracture and infection.
Brazilian butt lift- The advantage of Brazilian butt lift is that it helps to increase the size of butts without placing implants. As fatty tissue is obtained from the persons own body, there is no chance of rejection or minimal chance infection. It renders a natural looking result.