The 29-year-old supermodel said that she works hard to maintain her toned body, especially since the birth of her son, Flynn, in January 2011, reported Contactmusic.
"When you are working 16 to 17 hours, you need to know how to take care of yourself or you will fall off the wagon. I know its cliche, but I feel health is wealth," Kerr said.
The wife of actor Orlando Bloom also said that she follows a strict exercise regime of yoga and Pilates to help keep her baby weight off.
"I was lucky for a while there, I just did yoga. Now I am exercising a whole lot more, but it is for my job," she added.