Ask personal fitness trainers, and they'll tell you these are among the most-requested body parts at the gym nowadays. And, although we're each born with a particular shape, good nutrition and the right workout can help ylou achieve your own version of the fit legs, arms and abs sported by the most talked-about celebrities.

Check out the exercises that can help you get your own star-studded body:

Abdominals
When it comes to great abs, Madonna is at the top of the list. The 44-year-old mother of two is a role model for those who think age and children prevent you from keeping in shape and maintaining a tight, toned midsection!

The secret to flattering abs is good posture and focusing on those muscles while you exercise. By contracting the abdominal muscles, pointing the tailbone towards the floor and keeping your shoulders back and your head balanced on your neck (not leaning forward), you can look and feel taller and slimmer before you've counted one sit-up. Ab exercises should target the rectus abdominus (the muscle extending the length of the front of the abdomen) and the internal and external obliques (the muscles extending along the sides of the abdomen at an angle).

1. Ab Crunches (for upper abdominals)
Lie on your back with hands crossed over chest. With feet and hips on the floor, bend knees toward chest. To begin the exercise, lift torso slowly, elevating shoulder blades and moving ribs towards hips, crunching rib cage toward pelvis. Hold for two counts and lower to the starting position. Repeat.

2. Reverse Curl (for lower abdominals)
Begin in the same starting position used for the crunches. Contract abdominal muscles to lift hips off the floor; bring knees toward chest. Concentrate on using abs to lift pelvis toward lower rib cage. Hold for two counts and move hips back to the floor. Repeat.

3. Diagonal Crunches (for oblique muscles)
Begin in the same starting position used for the crunches. Raise shoulders, moving one shoulder (one side of chest) toward the opposite knee. Hold for two counts. Return shoulder to the floor and repeat. Switch sides. (Do not touch elbow to knee.)

For each exercise, aim for one to three sets of 10 to 20 repetitions, and rest for one minute between sets.

Arms
Renee Zellweger gets extra brownie points for packing on a stone to play Bridget Jones, then returning to super-fitness after filming. Great arms, like hers, require attention to both your biceps and triceps. The triceps are located at the back of the upper arm and are used whenever you push something, i.e. a baby pram or shopping trolley. The biceps, located at the front of the upper arm, are used for lifting light objects. The key is finding the right amount of resistance to reach fatigue in 6 to 20 repetitions.

1. Alternating Bicep Curl
Hold weights at sides with palms facing the body. Contract abs and squeeze shoulder blades together; align elbows and wrists with shoulders. Bend arm at the elbow while turning wrists outward until palms are facing the ceiling. Lift weight towards the shoulder without moving upper arm. Stop the motion when the weight meets the shoulder; hold for one count. Return weight to starting position. Repeat.

2. Triceps Kick Back
With left leg forward and slightly bent, place left hand on thigh for balance. Hold weight in right hand, elbow bent at a 90-degree angle, at waist height. Without moving the upper arm, straighten the arm at the elbow, so that the weight goes backward. Hold; return to starting position. Repeat. Switch sides.

For each exercise, aim for one to two sets of 10 to 20 repetitions, and rest for one minute between sets.

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