The Core

These 3 basic moves can make a big difference in your core strength.

The Bicycle exercise is the best move to target the rectus abdominis (i.e., the 'six pack') and the obliques (the waist), according to a study done by the American Council on Exercise. To do this exercise correctly:
1. Lie face up on the floor and lace your fingers behind your head.

2. Bring the knees in towards the chest and lift the shoulder blades off the ground without pulling on the neck.

3. Straighten the left leg out while simultaneously turning the upper body to the right, bringing the left elbow towards the right knee.

4. Switch sides, bringing the right elbow towards the left knee.

5. Continue alternating sides in a 'pedaling' motion for 15-25 reps.

The plank exercise is a great way to build endurance in both the abs and back, as well as stabilizer muscles. To do it right:
1. Lie face down on mat resting on the forearms, palms flat on the floor.

2. Push off the floor, raising up onto toes and resting on the elbows.

3. Keep your back flat, in a straight line from head to heels.

4. Tilt your pelvis and contract your abdominals to prevent your rear end from sticking up in the air.

5. Hold for 20 to 60 seconds, lower and repeat for 3-5 reps.

The exercise ball is an excellent tool to strengthen the abs. To do it right:
1. Lie face-up with the ball resting under your mid/lower back.

2. Cross your arms over the chest or place them behind your head.

3. Contract your abs to lift your torso off the ball, pulling the bottom of your ribcage down toward your hips.

4. As you curl up, keep the ball stable (i.e., you shouldn't roll).

5. Lower back down, getting a stretch in the abs, and repeat for 12-16 reps.