10 Minutes to Rock Solid Abs

If you want to strengthen your core, here's some of my favorite exercises to really engage all those muscles-including your low back, obliques, hip/glutes, even some of your upper body muscles. Do this routine 3 days/week for maximum results. (Oh, and remember, if you've got a "little extra" around the middle, you're going to need to do more than this! :)

1. Stability Ball Pelvic Tilt crunch
Grab a 5- to 10-pound medicine ball. Lie faceup on a stability ball with back and head pressed into the ball, your feet together on the floor, and the medicine ball positioned against your chest (A). Brace your abs and crunch up until your shoulders are off the ball. Then reach the ball toward the ceiling (B). That's 1 rep. Do 20 reps.

2. Walk the Plank and Rotate
Get in plank position with your hands on a 12- to 18-inch step (A). With your weight on your left arm, rotate your body while raising your right arm toward the ceiling (B). Return to plank position and step your right arm down to the right of the bench, then your left arm down to the left of the bench. Step back up, leading with your left arm. That's 1 rep. Do 15-20 reps.

3. Arm Pull Over Straight-Leg Crunch
Grab a pair of 8- to 10-pound dumbbells and lie on your back with your arms behind you. Extend your legs at a 45-degree angle (A). Bring your arms up over your chest and lift your shoulders off the mat while raising your legs until they're perpendicular to the floor (B). Return to start (don't let your legs touch the floor). That's 1 rep. Do 20 reps.

4. The Matrix
Grab a 5- to 10-pound medicine ball and kneel on the floor with your knees hip-width apart. Lengthen your spine and press the ball against your abs (A). Slowly lean back as far as possible, keeping your knees planted (B). Hold the reclined position for 3 seconds, then use your core to slowly come up to the starting position. That's 1 rep. Do 20-25 reps.

5. Nose-to-Knee Crunch
Get in plank position with your hands shoulder-width apart on a stability ball (A). Draw your right knee toward your chest (B). Hold for 1 second, then return to plank position. That's 1 rep. Do 20 reps.

6. Prone Oblique Roll
Get in plank position with your shins about hip-width apart on a stability ball and your hands shoulder-width apart on the floor (A). Keeping your feet on the ball, draw your right knee toward your right shoulder (the left just comes along for the ride) (B). Return to center.
Get in plank position with your shins about hip-width apart on a stability ball and your hands shoulder-width apart on the floor (A). Keeping your feet on the ball, draw your right knee toward your right shoulder (the left just comes along for the ride) (B). Return to center. Do 20 reps.

7. Back Extension Rear Leg Raise
Rest your hips and stomach on a stability ball. Straighten your legs and position your toes hip-width apart on the floor. Extend your arms in line with your shoulders (A). Lift your right leg about 6 inches off of the floor while reaching your arms as far out as possible (B). That's 1 rep. Do 20-25 reps.

8. REPEAT CIRCUIT

Source: Womens Health