What breathing technique is introduced at the 401 skill level?

At the 401 skill level, the focus is on refining respiratory techniques that enhance the swimmer's efficiency and comfort in the water. Rotary breathing with equipment is a technique that allows swimmers to practice breathing patterns while utilizing flotation or training aids. This approach helps swimmers gain confidence in their ability to alternate between inhaling and exhaling as they execute strokes, which is crucial for maintaining rhythm and stamina during swimming.

By integrating equipment, swimmers can concentrate on their breathing mechanics without the immediate worry of buoyancy or balance. This is particularly beneficial for those transitioning to more advanced swimming techniques since it promotes a smoother integration of breath control with stroke performance. Mastering rotary breathing is essential for swimmers as they progress in skill level, allowing them to manage inhalation and exhalation more effectively during various strokes and distances.

The other options do not align with the goals set at the 401 skill level, as they either involve simplified or restricted breathing methods that are not conducive to developing advanced swimming techniques.