Cindy Crawford: Supermodel reveals she is still working out at 54

She said: "The way I've exercised has changed. In my 20s, I would work out hard and flop down on the couch. "Now my goal is not to get hurt. So, I have added a lot more stretching and Pilates, and I don't feel as compelled to do those tough workouts any more. "When you're young, you have the beauty and strength of youth, but you're really hard on yourself and you haven't done the work on the inside yet. As you get older, you've figured out who you are, but you're thinking, 'That's not where it used to be any more!'

"Maybe that's the point - having insecurities and flaws is what makes us human."

Sharing her secrets to maintaining a lithe figure in middle age, mother-of-two Cindy added: "I don't like the word 'diet', but I still choose to eat well.

"I was never one of the people who could eat what I wanted.

"Even I used to get annoyed when Kate Moss would be eating a burger and fries and smoking a cigarette! "When I moved to New York, I knew I was going to have to change the way I ate or I wouldn't be able to get into the clothes - and, by the way, the clothes were much bigger then than the sample sizes now."

Cindy was famously married to Hollywood heartthrob Richard Gere from 1991 to 1995. She wed businessman Rande Gerber, her husband of 22 years, in 1998.

The supermodel - who was posing for the March issue of Red magazine - added: "It's friendship. With my husband, I feel even if we weren't together, we'd be friends.

"Of course, you have to have sexual chemistry, but our relationship is based on friendship and mutual respect."

On being a mother, she added: "Parenting is the hardest and most rewarding job. Rande and I made our kids feel included.

"If we had friends over for dinner, they sat with us. That has served them well."