I agree with you that anxiety makes it worse..A stutter step is a footwork technique in tennis.The term has fallen out of usage in the modern game, but the technique is still used. The stutter step is basically running forward with small steps while squatting, having the back perpendicular to the ground, and having the racquet up in front. It is a technique used to approach the net after a strong approach shot in preparation for a volley. It allows the player to be in a stable ready position while moving forward and creating a higher percentage volley that makes me much more prone to anxiety.
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Anxiety therapy technique without medications