You think those killer calf muscles and toned arms sculpt themselves? No way! Ever since she was a little girl, Kate Middleton has thrown herself into any physical activity she could, and it's set her in very good stead. At school, she was on the team for tennis, field hockey, swimming, netball, and rounders; and as she hit her 20s and 30s, she has kept some of these sports in her repertoire, ditched others, and added some new ones. So how does the duchess stay in shape with sports?