The stability ball is a great tool to work the abdominal, but many people neglect using it for the lower back.
Back extensions on the ball are a great core exercise.  You can learn this exercise plus 7 more great core exercises in my core workout videos.
Core training is more than just working the abs, so make sure you also focus on the lower back in your core workouts.

There are many core exercises that you can do on an exercise ball.  The ball will make your abs, lower back and core muscles work much harder because the ball is unstable.
 
Crunches on the ball are a great exercsie for beginners to master and you can learn that exercise plus 7 more great core exercises on my exercise ball core workout video.
 

If you're into core training chances are you're doing tons of abdominal exercises, but it is just as important to focus on lower back exercises.
The lower back muscles compliment the abdominals to keep the spine stable.
Click here to watch a free video explaining the benefits of core training.

If you're looking for free ab workout tips, check out Ab-Core-and-Stomach-Exercises.com.
Ab-Core-and-Stomach-Exercises.com has pictures of over 100 ab exercises and free ab workouts.
You can also find cheap ab workout and core workout videos.
Check it out today and get in better shape.

Core training is becoming a popular philosophy in fitness because it is so effective at doing 2 major things.  Core training can help to #1) improve performance and #2) decrease the risk of injury.
 
Click to learn more about my 2 30 minute core workout videos.
 
Or watch a free video on the benefits of core training.
 
Yours in Health
Charles

If you want to work your glutes and improve your balance at the same time, try adding hip extensions on a cable machine.
 
Visit Best-Leg-Exercises.com to learn more of the best hip exercises.
 
 

The Gluteus Medius is an important hip muscle.  It helps to stabilize the pelvis and hip and in turn helps to stabilize the knee.
 
Balance exercises and glute exercises are so important and you can use a cable machine to improve your balance and increase hip stability.
 
Visit Best-Leg-Exercises.com to learn more of the best glute and hip exercises.

Balance exercises are important for increasing hip stability.  You can use a cable machine or resistance bands to strengthen your hips and work on balance at the same time.
 
Try adding the standing cable hip flexion motion to your workouts to strengthen your hip flexors and work on balance.
 
Visit Best-Leg-Exercises.com to learn more of the best hip exercises.

If you want to strengthen your inner thigh, try getting off the machine and using a cable machine instead.
When you sit down on a machine, you don't really engage your core muscles or work on balance.
Standing cable hip adductions are a great hip exercise for women and men.
Visit Best-Leg-Exercises.com to learn more hip exercises.

Crunches on the floor are a great ab exercise, but after you can do 25 reps, it's time to challenge your abs.
You can use a cable machine or a resistance band to work your abdominals harder.
If you don't have cables you can also use dumbbells or a medicine ball.
The main point is that once crunches are easy, try to make them harder.