Hollywood hottie Amanda Seyfried is no stranger to dating extremely attractive leading men – on screen and off. In her latest action thriller flick In Time, she's steamin' up the big screen with her hubba hubba co-star Justin Timberlake.

So just how did the beautiful, wide-eyed actress get her bod prepped for her wild wardrobe and sultry scenes? Fortunately, the knockout talent didn't really have to get fit in time for In Time…because she's been working with powerhouse celebrity trainer Harley Pasternak for the last few years!

The amazing results show. Having trained everyone from Halle Berry, Lady Gaga and Megan Fox to Jennifer Hudson and Milla Jovovich, Pasternak's incredible client list reads like an IMDB page. The talented trainer definitely knows his stuff when it comes to all things health and fitness.

To keep her body toned, fit and fabulous, Seyfried has been following Pasternak's 5-Factor Program. "She works out really hard and looks phenomenal. She knows what it takes and doesn't need to spend a whole lot of time in the gym," Pasternak says.

On Pasternak's 5-Factor Diet, Seyfried eats five times a day: breakfast, a snack, lunch, a snack and dinner. A snack is half the size of a meal. Every time she eats, there are five factors: a low-fat protein, a healthy carbohydrate, a fiber, healthy fats (or the absence of unhealthy fats) and a sugar-free beverage.

The best part? When you follow Pasternak's results-driven program, you'll get one "free day" per week, where you can eat "whatever you want, however you want, whenever you want it!" Pasternak says.

In addition to his healthy diet plan, Pasternak's clients train with his powerful 5-Factor Hollywood Workout. The workout uses an advanced technique called "supersetting," in which you do two exercises back-to-back without resting in between. This makes the workout shorter (as little as 25 minutes a day, 5 days per week) but keeps your heart rate elevated longer, so you burn more calories.

That's why we were totally pumped when Pasternak revealed a sample of Seyfried's 5-Factor Workout, here:

You'll Need: A jump rope, a set of dumbbells, a floor mat, and a bench with an incline feature.

How it Works: You'll do 5 workouts a week, each 25 minutes long and broken into five 5-minute phases. Each is done as a circuit, and the number of reps, sets, type of exercises and resistance level should change every day.

"For your body to keep changing, your program needs to keep changing," Pasternak says.


5 Minutes of Cardio Warm-Up

What to do: Jump rope, walk, cycle, stair climb or use a cardio machine set on a low level. Just get moving!


5 Minutes of Upper-Body Strength Training: Bent-Over Dumbbell Rows

How to do it: Sit on the edge of a bench holding a dumbbell in each hand. Bend forward at the waist – keeping your back flat – until your back is almost parallel to the floor (your chest should come down as close to your thighs as possible). Let your arms hang straight down, with palms facing each other. Slowly draw your elbows up as high as you can, keeping your arms close to your sides. Pause, then slowly lower them back down until your arms are straight once again. Repeat.

Tip: The amount of weight should be based on what you can finish by the end of the set. Don't go beyond your limits but challenge yourself!


5 Minutes of Lower-Body Strength Training: Reverse Lunges

How to do it: Stand with your legs shoulder width apart. Begin by stepping backward, planting your foot, and then bend your front leg until it reaches about a 90-degree angle. The knee of your rear leg should also flex until it almost touches the floor.

At this point you will be in the same position as you are when doing a regular lunge. Then, complete the rep by pushing up with your front foot and leg until you're again in the starting position. Repeat with the other leg.

Tip: Make sure you keep your head forward and upper body upright throughout the exercise.


5 Minutes of Core Training: Double Crunches

How to do it: Lie down with your back flat against the floor. Lift your knees so your legs form a "V" position with the knees pointing upward. Lift your feet so the calves are parallel to the floor and your thighs are perpendicular to the floor. Your hands should be behind your head and the elbows pointed outward.

Lift your head and shoulders off the floor while you pull your knees toward your head. Your pelvis should come off the ground. Exhale while you try to touch your knees to your chest. Make sure to keep your elbows extended outward so the motion of the lift comes from the abdominal area. As you inhale, return your legs to the starting position with your thighs perpendicular to the floor. Lower the head back to the ground, as well. Repeat.

Tip: Focus on the muscle groups in the abdominal area and really feel the burn! Just remember to breathe.


5 Minutes (or longer) of Fat-Burning Cardio Work

How to do it: For the last phase, go back to whatever activity you were doing in Phase 1.

Tip: If you can go longer and have the time, go for it! The longer you exercise, the more calories you'll burn - just make sure you have enough energy to rock your workout the next day. Remember to change up the type of exercises, reps, sets and resistance level each time.

"Starting today, get moving. Right now! As soon as you read this article, put on a comfortable pair of shoes and go for a walk. It's all about making small choices," Pasternak advises."Little things like taking the stairs instead of the elevator. Walking that extra block. Parking your car at the furthest point in the parking log. You've heard it a million times but it really does add up."

Catch Pasternak starring in the new ABC series The Revolution premiering in January, and learn more about his 5-factor program at


About Kristen Aldridge

Kristen Aldridge lends her pop culture expertise to Yahoo! as host of "omg! NOW." Receiving millions of hits per day, the hugely popular daily entertainment news program is one of the most-watched on the web. As a seasoned entertainment journalist, pop culture expert, fashion addict and lover of all things creative, she is founder of and recently launched her own celeb-inspired fashion line and smartphone app. Connect with Kristen to talk all things celebrity via Twitter and Facebook, or visit her official website.