She says, "We had a very serious race... I don't know how I did it either; I forced myself every morning. We had these watches and these things you attach to the sneakers and it clocks all the miles that you do."
But Klum, who admits she's fiercely competitive, came out way ahead. She adds, "I ran over 120 miles in seven weeks and he did 45 miles (72.4 kilometres)."