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The Extra host, who also stars in the comedy Adventures of Serial Buddies, stays active with Body Reset Diet author-trainer Harley Pasternak. To keep her tummy toned, "I'll do 20 straight sit-ups. Then I'll put one ankle over the knee and do 10 to the side and switch. Then I fight for the last 10," says Menounos, 34. Her affection for Pasternak runs deep. "I'd go play basketball with Harley!" she says. Adds the trainer: "She always looks awesome."

HARLEY PASTERNAK

Try This!

Stand with feet shoulder-width apart and an 8-lb. dumbbell in right hand. Place fingers of left hand on left temple. Crunch right at the waist (don't move your lower body!), then return to start. Do 20 reps, then switch sides.

Kelly's ARMS!

Trainer Jeanette Jenkins "helps me get those Michelle Obama arms," says Kelly Rowland, 32, currently on the road for her Lights Out tour. The secret? "She trains five days a week," says Jenkins, whose sessions can include up to 100 push-ups. "Her upper body looks feminine and sculpted."

JEANETTE JENKINS

TRY THIS! In plank position on your hands, bring your knee to the opposite elbow, then switch. Do 15 reps. For more moves, go to thehollywood trainer.com.

Gwyneth's BUTT!

Before Tracy Anderson, "my butt was my worst part," says Gwyneth Paltrow, 40. But thanks to daily dance-cardio routines designed by Anderson, the Iron Man 3 star now has the booty "of a 22-year-old!" Anderson agrees: "Hers used to droop. Now it's lifted and never coming back down!"

TRACY ANDERSON

Try This!

On hands and knees, squeeze a 3-lb. weight behind one knee. Bring knee to chest, then bring leg back so thigh is parallel to floor. Do 30--40 reps.

Jennifer's LEGS!

"I credit Mandy for my legs," says Aniston, 44, who sweats through yoga poses combined with toning exercises with Yogalosophy author Mandy Ingber three times a week. "I could never get rid of that little saddlebag, but it melted away." Before, "Jennifer was more of a gym rat," says Ingber. Now fitness is "more holistic. The workout means more than just fitting into a great pair of jeans." Though that's an added bonus: "She is athletic and slim."

MANDY INGBER

TRY THIS!

Stand with hands in prayer and legs 3 to 4 ft. apart. Bend until your butt and knees are level while torso is straight. Hold for eight deep breaths, then straighten and bend back to sitting 10 times.

FOR DAILY FIT TIPS FROM MANDY INGBER AND HARLEY PASTERNAK, GO TO PEOPLE.COM/HOTTESTBODIES

  • Contributors:
  • with Melody Chiu.