Kourtney Kardashian's Post-Baby Fitness Tip? Sex!

kourtney kardashian
Buzz, Self

Sex and superfoods are some of the secrets behind Kourtney Kardashian's fit post-pregnancy body.

The phone rings at exactly 11 a.m., New York time: "Hi, it's Kourtney!" The eldest sister in the Kardashian family is calling from her home in Los Angeles, where, at 8 a.m., the sun has barely peeked over the Hollywood Hills. "Oh, this isn't early for me," says the 32-year-old. "This is normal." Her son, Mason, has been getting her up at the crack of dawn since he was born 18 months ago, but the new mom isn't complaining. In fact, she's never been happier…or healthier. Now that Mason's stopped nursing, she's been able to get her exercise routine back on track (check out her runner's workout here). And because of Mason, Kourtney's embraced a way of eating that is so clean and organic, even she's surprised. To top it all off, her once turbulent relationship with boyfriend (and Mason's dad) Scott Disick is finally in a good, stable place.

Of course, all of that could change by the next season of Keeping Up With the Kardashians, which begins again this summer. But in the meantime, Kourtney says she feels amazing, especially when she's rocking a bikini! "I'm proof that even after having a baby, you can look better and sexier than ever!" How? Read on for Kourtney's essential healthy-living tips. Why Katie Holmes Is Obsessed With Being Thin

1: Exercise to Maintain a Healthy Lifestyle, No Excuses!
"My family has always been into exercise," says Kourtney.

When her mom, Kris, married Olympic athlete Bruce Jenner, he encouraged everyone to take Tae Bo classes. "Kim and I went almost every day after school," says Kourtney. "Sometimes we'd do two classes in a row because we had so much energy." As she got older, she discovered her love for running, which she continued doing right up until her seventh month of pregnancy. "But carrying an extra 40 pounds started to bother my knees," she says, "so I had to stop."

After Mason was born, and as soon as she got the doctor's okay, she slowly returned to her old routine, but it hasn't been easy. "Women always ask me how to get back in shape after having a baby," she says. "I always say, 'Know when's the right time for your workout and commit to doing it.'" VIDEO: How to Date as a Plus-Sized Woman

To read the rest, visit Shape: Reality TV Star Kourtney Kardashian on Having a Baby, Food Cravings, and More

More from Shape:

This article was originally published at . Reprinted with permission from the author.