Heidi Klum's children help her stay fit

Supermodel Heidi Klum says she manages to keep her body in shape by staying constantly on the go with her four children and merging her busy schedule with theirs.
The 39-year-old, who separated from her soul singer husband Seal last year, said that its hard to get time to work out from her busy schedule and so she merges her busy schedule with her children, People magazine reported.
"It's very hard to find time obviously to work out. I'm like a mom and dad in one. When I go shopping I put on my sneakers and my [fitness] clothes. I run through the store or I take the dogs and the children and I go up the canyon or I go into the backyard and I jump with my kids on the trampoline, so I try to put the exercise into my daily routine," she said.

While she gained 45 pounds with each of her pregnancies, Klum said she never dieted.
"I have never really dieted. You have to really look into it and understand it and understand food and what It does for your body and what it needs and doesn't," she added.