Sentences with phrase «main differences between crunches»
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.
http://www.ab-core-and-stomach-exercises.com/
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.