Which breathing technique is commonly utilized in yoga to aid in relaxation?

Deep belly breathing, also known as diaphragmatic breathing, is a fundamental technique in yoga that promotes relaxation. This method involves inhaling deeply through the nose, allowing the diaphragm to expand fully, leading to the abdomen rising. As you exhale slowly, the abdomen contracts, helping to release tension and stress. This type of breathing stimulates the parasympathetic nervous system, which is responsible for the body's rest and digest functions, further enhancing the state of relaxation.

In contrast, the other techniques listed do not effectively support relaxation. Rapid breathing can increase heart rate and anxiety levels rather than calming the body and mind. Shallow breathing typically occurs during stress and can lead to a feeling of tension and anxiety, as it limits oxygen intake and does not engage the diaphragm. Forced exhalation involves expelling air quickly and can create a sense of urgency or tension, rather than relaxation. Thus, deep belly breathing stands out as the technique most conducive to fostering a calm and tranquil state during yoga practice.