Updated January 28, 2013
Saw is an intricate back and hamstring stretch. I like it a lot because it is a wonderful way to experience oppositional stretch - with the chest and upper back pulled open by the front and back arms reaching in opposite directions. As you become more familiar with the exercise, the oppositional dynamic between the front shoulder and the opposite hip is also very interesting.
Saw is an important lesson in pelvic stability as well. While there is a lot of activity in the upper body, the abdominals keep the hips still and even throughout the exercise.
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