Helena Christensen stays in shape with boxing.

The 42-year-old supermodel took up the sport a few years ago in order to maintain her trim figure but admitted she struggles to motivate herself to exercise.

She said: "I box twice a week when I'm at home in New York. When I'm away, I'll try some pathetic attempt to do 10 push-ups and lunges in my hotel room, but I have this wall I need to get over in my mind before I can work out."

While Helena has an enviable figure, she is insecure about her body shape and has the same worries as other women.

She added in an interview with the Daily Telegraph newspaper: "It's not like I wake up in the mornings going, 'Oh, I'm so perfect, I don't need to do anything.'

"Every model I know in this business has had the same issues as every other woman, maybe more so.

"You can easily be made to feel self-conscious in this job.

"It's really intimidating to go on the beach in a bikini.