An example of assisted retraction and resisted protraction on the Pilates apparatus is?

The Swan on the Wunda chair is a prime example of assisted retraction and resisted protraction due to the mechanics involved in the exercise. In this movement, the individual performs a back extension while using the resistance of the springs on the Wunda chair to facilitate thoracic extension. The springs assist in retracting the shoulder blades as the torso extends, thus guiding the body into a retracted position.

As the exercise progresses into the protraction phase, the springs provide resistance, leading to a controlled forward movement of the arms and torso. This combination allows for a comprehensive engagement of the upper back muscles, specifically targeting the scapular stabilizers during the retraction and protracting phases.

The other options do not exhibit the same dual action of specifically assisted retraction and resisted protraction in the context of Pilates apparatus work. The Rolling Like a Ball, Cat Stretch, and Teaser on the Reformer focus on different movement principles and do not incorporate the same mechanics related to retraction and protraction provided by the springs on the Wunda chair. Therefore, the Swan on the Wunda chair is unique in demonstrating this combination effectively within the context of assisted and resisted movements.