Repeat it at least a hundred times. If you still can't do it after that, you super, super suck.
… [nudges him in the leg with her foot.] Loosen up. Strength is fine, but fluidity is vital. [rocks lightly on her heels, demonstrating her own posture. It's confident and stable, but there's an easiness to it—if she was shoved, she wouldn't stumble.]