Jessica's trainer: Here's how to lose weight

So, Jessica Simpson has finally revealed her post-baby body. She told Katie Couric she's lost more than 40 lbs since giving birth to her baby girl, Maxwell Drew.

How did she do it? Well, she's using Weight Watchers, for one, but she also hits the gym! Her personal trainer, Harley Pasternak, shares some of the exercises he used to help Simpson get back in shape. 

Pasternak says it’s easy for moms to lose weight by doing simple exercises, like walking up and down stairs and parking the car a little further away. If you're a new mom, try these exercise tips with your baby:

• Squats holding your child in your arms
• Baby trunk twist
• Baby bench presses 
• Sit-ups with baby in your lap
• Rocking sit-ups with baby in your lap

Pasternak says nutrition is just as important -- if not more important -- as fitness, so remember to exercise and eat healthy: 

• Eat five times a day
• Eat simple meals
• Go for sugarless drinks
• Don't forget to snacks between meals
• And don't deprive yourself of meals

Do you have any favorite exercise or nutrition tips of your own? Share them with us in the comments below!