Water Safety Instructor (WSI) Practice Exam

What characterizes the power phase of a stroke?

1. The part of the stroke where the body rotates

2. The part of the stroke where arms and legs aren't moving

3. The part of the stroke where limbs propel the body

4. The part of the stroke focused on breathing

The correct answer is: The part of the stroke where limbs propel the body

The power phase of a stroke is defined by the moment when the limbs are actively propelling the body through the water. This phase is characterized by the forceful movement of the arms and legs as they work to generate speed and propel the swimmer forward. In this phase, proper technique and timing are crucial, as it is during this part of the stroke that the swimmer's body gains momentum. In contrast, the other options describe different aspects of swimming that occur at various times in a stroke. The rotation of the body is crucial for many strokes but is not the defining feature of the power phase. Similarly, when arms and legs aren’t moving, the swimmer is likely in a non-productive phase of the stroke, which does not contribute to propulsion. Lastly, while breathing is essential for maintaining energy and comfort in swimming, it is typically not a focus during the power phase, as the swimmer's primary goal then is to maximize propulsion rather than to inhale or exhale.