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You don’t have to live in Hollywood to look like you’re ready to step out of a summer blockbuster flick. (You don’t need to do tons of situps either.) But if you really want to look like the girl on the cover of the Sports Illustrated Swimsuit Issue or get abs like that guy in “Twilight,” you do have to stick to a lean diet, practice strength workouts that challenge multiple muscle groups, and mix in a little cardio. We spoke with trainers who work with stars to get the scoop on how to score a swoon-worthy six-pack.

Jennifer Garner

To keep Garner’s abs in top form, she does moves like the “painful push away,” says her trainer Valerie Waters. Start in pushup position with ValSlides under both hands, then slide both hands in front of you without breaking form until you start to shake. As soon as you feel a shake, walk your toes in. Repeat. Depending on your level of ability, you’ll be able to slide out anywhere from 2 to 5 inches.

50 Cent

If you want cut abs like Fiddy, focus on working your legs and the area below the navel. Jay Cardiello, the rapper’s live-in trainer of four years, uses box jumps, squat jumps and burpees to help 50 Cent fire up fat burning and target his lower abs.

Carrie Underwood

Swing your way into a solid core like Carrie Underwood did. The country star has been spotted taking Paul Katami’s kettlebell classes at Equinox’s West Hollywood location. “The great thing about kettlebells is that you get a full-body workout and all the moves incorporate your core in a major way,” says Katami. One of his favorite moves: the rotating squat. Hold a 5- to 10-pound kettlebell in your right hand, and lift it overhead. Keeping your right arm extended, lower into a squat to reach your left hand to the floor while looking up toward the kettlebell. Return to standing.

Lady Gaga

Underneath her kooky outfits, Lady Gaga rocks an enviable six-pack that she shows off on occasion. To get a flat and toned stomach like hers, you need to mix a variety of core exercises into your routine. “First and foremost you have to train your abs on all three planes,” says Gaga’s trainer Harley Pasternak. “You have to train them forward and back with something like a crunch or double crunch. You have to train your abs laterally to hit the obliques with something like a dumbbell side bend. And you have to train your abs on a rotational plane – your transverse abs – and you can do that from a seated trunk twist.”

Ryan Reynolds

Get one good look at Ryan Reynolds’s buzzed-about six-pack and it’s no wonder he was named People magazine’s “Sexiest Man Alive” in 2010. To gear up for his role in “Green Lantern,” he trained six days a week for 90 minutes a day while shooting on location in New Orleans. “Ryan would spend the first 20 to 30 minutes of every workout working his abs to warm up his core,” says trainer Bobby Strom, who recommends chiseling your middle with the medicine ball chop (5 sets, 15 to 20 reps). Strom’s twist: Keep both heels on the ground and don’t pivot your foot when raising the medicine ball overhead or lowering to the side – your obliques will have to work harder.