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It is my opinion that in order to have fluid organic animation , your graph editor must have clean, organized curves. Working simultaneously in the viewport,taking careful notice of the spacing, and checking the curves in your graph editor, you can assure to your self that you can obtain nice arcs and animation that flows from one pose to the next. You can control the snappiness of the animation by how you slow in and out of your extreme poses. Using tools like ATools make