Steadicam

Above at 0.50 is an example of steadicam. When you move while you're shooting, the camera seems to pick up your body's every jolt and shake no matter how hard you try to keep it level. But in professional movies and television shows you see lots of long, moving handheld shots that have no jolts and shakes at all. Cameramen achieve this remarkable effect using a device called a Steadicam®. Since their introduction in 1976, Steadicams have become one of the most important tools in the filmmaking world. I think it was used to create a smooth surface, therefore making the show seem more professional.