Optimal propulsion positioning is

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Optimal propulsion positioning for efficient swimming is achieved when the hands are positioned slightly posterior to the shoulder girdle and the elbows are at an angle of 100º to 120º. This allows for proper alignment of the shoulders, hips, and legs, and reduces drag in the water. Hands placed too far anterior or posterior to the shoulder girdle can create unnecessary resistance and decrease efficiency in swimming. Elbows at more than 120º can also cause increased drag and decrease the effectiveness of the stroke.

Optimal Propulsion Positioning Is