Overview
An excellent bowing preparatory exercise.
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Practice
Practice this as the first step in your warm up routine to get any habitual tension out of your arm joints before practice.
Common Pitfalls
Pitfall #1: tensing your shoulder as you move through the exercise. Keep your right arm feeling as much like a cooked spaghetti noodle as your can, noticing the easy in your shoulder joint as you let momentum drive the swinging motion.