Sentences with phrase «main difference between crunches»
The Second main difference between crunches on the floor and crunches on the ball is that the position of your hips, pelvis, and spine changes.
http://www.ab-core-and-stomach-exercises.com/
If you have read my page on the exercise ball, then you know that there are two main differences between crunches on the floor and crunches on the ball.